The Grow Awards 2026 🏆
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Tag 63 - Beginn der 10 Woche. Die Blätter haben sich diese Woche leider weiter verschlechtert, Blätter vertrocknen und sterben ab, zudem kommt, dass ich an den einzelnen Blättern Anzeichen von Stickstoff oder Eisenmangel wahrgenommen habe. Deshalb habe ich den ph-wert weiter gesenkt um der Pflanze die Aufnahme der Nährstoffe zu erleichtern. Seit dem ich Mitte letzter Woche den pH-wert gesenkt habe, habe ich den Eindruck, dass das Blattsterben sich verlangsamt hat. Ich werde das weiter beobachten. Leider kann ich nach wie vor nichts gegen das übermäßige Licht und die Hitze an der Pflanzenspitze machen. Jedoch bin ich beeindruckt wie viele Fehler die Pflanze einem verzeiht, denn die Buds einwickeln sich weiterhin super, sind frostig und duften wahnsinnig süß! Ich bin weiterhin gespannt wie sie sich die nächste Zeit macht und werde weiterhin mein bestes geben um ihr den Stress zu reduzieren. Gedüngt wurde an Tag 58 der letzten Woche. Nährstofflösung: 1 ml/l - Sensi Cal-Mag Xtra Advanced Nutrients. 1 ml/l - Big Bud Advanced Nutrients 1 ml/l - Bud Candy Advanced Nutrients. 1 ml/l - B-52 Advanced Nutrients. 2 ml/l - pH Perfect Sensi Bloom Part A. 2 ml/l - pH Perfect Sensi Bloom Part B.
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* ************** Week 7 - May 23 to 29, 2020 - Days 43 to 49 from germination **************** * Getting the pictures in so far....... *******Daily Detail: May 23, Day 43 -
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Germination date 🌱 28/11/2021 Day 70 09/02/2022 Strain 🍁 Solfire Gardens Bahama Bussdown (Runtz x Bahama Mama) THC% • Unknown 💡 Mars Hydro FC-E6500 • Power draw 650W + 5% • Max coverage 5 x 5 • LED 3978 pcs high quality chips • Max Yield 2.5g / watt • Noise level 0 DB • Removable Driver & Light bars • Daisy chain • Fast cool system https://marshydroled.co.uk/ 🇬🇧 PROMO CODE • (organicnature420) DISCOUNT https://www.mars-hydro.com/ 🇺🇲 PROMO CODE • (ORG420) DISCOUNT 👍🏻 ⛺ Mars Hydro 150 x 150 x 200cm 📤📥 AC infinity 6inch 💧 10lt dehumidifier ❄️ 3.1kw air con system 💉 Nutrients GreenBuzzLiquids 🇩🇪 ⭐⭐⭐⭐⭐ Organic Grow Liquid • 1-4ml until 2wk flower Organic Bloom Liquid • 2-4ml flower stage Organic More PK • 2-4ml +wk3 of flower Organic Calmag • 1-2ml/lt whole grow Fast Plants Spray • first 2wks at night lights off More Roots • 2-5ml veg +2wks flower Fast Buds • 5ml 12days before flower until wk1 Humic Acid Plus • 2-5ml whole grow Growzyme • 2-5ml whole grow Big Fruits • 2-5ml flower stage Clean Fruits • 5ml flush 1wk Ph powder Root Gel Living Organics https://greenbuzzliquids.com/ PROMO CODE • organicnature420 15% off ✌️🏼 🥥 Growing Media • Coco Coir 💡 65% Notes 📝 Looking super frosty and some lovely purple colours coming through. All 3 Bahama Bussdown are looking 🔥 .. look forward to the next couple of weeks. Light upto %80 ✌️🏼 if your thinking of changing nutrient company's please think of GreenBuzzLiquids. They honestly are a game changer and you can thank me later 😉 Discount codes in bio for Mars and GreenBuzzLiquids 👍🏻
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i looked awesome all growcycle...i streched alot & i noticed it drank alot more then the other plants while growing...had a good yield, i´m very happy overall
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Chopped the second Frostbanger after a week's flush. As you can see from the pics she is a beauty. Very good leaf to bud ratio will be easy to trim. Smell is strong. Next up will be the gorilla zkittles. Which is the biggest in the tent by far. But it's taking a while to ripen up. Then that's just leaves 1 frostbanger which I planted a couple weeks after the rest. The Frostbangers are just like photoperiods. Even for F3s they have been very stable. I can't wait to try the F8 banana purple punch 😳. This will be the last update unless I decide to add a week for the plant that's behind. Which also looks very good. If not I'll do a review and give the final weight in the next update. Very happy with this run. 🌱❄️💨
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@GrowGuy97
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Day 28 - RH 58% Temp 81F . Ladies are growing great, they are really starting to turn into little bushes & the double mainline is going strong 💪🏻 Thanks for following friends & make sure to check back for daily updates! Happy growing✌️🏼🌱 Day 29 - RH 57% Temp 78F . Couldn’t be happier with the growth! Day 30 - RH 60% Temp 78F . Everything is looking great! Day 31 - RH 51% Temp 78F . Watered today with PH at 6.5, all 3 ladies are doing amazing!👍🏼 Day 32 - RH 53% Temp 81F . Considering topping the ladies tomorrow not sure yet! Still growing beautifully! Day 33 - RH 52% Temp is 80F - Bushing out like crazy & growing strong! The double mainline seems to be bouncing back as well! So far very impressed with this strain😍👍🏼 Day 34 - RH 56% Temp is 79F - Decided to top the two bushy plants today, they also got fed today with PH about 6.3
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This week we had to go on a destination wedding and had to have friends house sit. Again 😔 I hate having to do that, but this time everything went very smoothly. We didnt lose any plants lol. Before we left I was able to get #2 transplanted in a 7x7 nursery pot. Man was she ready too! I've decided since I am only growing 2 Choc Mknt OGs that i will be training one(both high and low stress) and this plant(#2) I will be leaving completely alone to do her own thing 🤞 Watering has went smoothly this week. Both plants only wanting water once in this 7 day stretch. I think because the transplant soil was already very moist. #1 has rooted and already started taking off from her transplant last week. Tent update: Our ES300 by the green sunshine company arrived this week!!! I was able to get it I'll installed before leaving. So now in my Vivosun 2x4 tent I have 1 es300. I moved the viparspectra to my large flower tent. The Choc mint seem to absolutely love this light. I started it at 70% power(its a dimmable light fixture) and am slowly moving it up over the course of a week. Day 12: my friend reported great growth on #2!! So she is rooted as well and doing good. Also, the heat in my 2x4 is in the low 80° getting up to 85° even 90°(for a few minutes) I'm mostly running Sativas which love the heat, but I have noticed Choc Mint OG prefers it a little cooler. Her top leaves are canoeing and curling a bit. Thanks for checking out my diary! Sorry this week was lacking a bit 🤷‍♂️ now that I'm home they're only gonna get better!
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@BloodBath
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I will be focusing this diary on the smoothie strain but you’ll be seeing some other plants in the tent that are not the same strain. I only have room in this tent so bare with me. There are 2 Smoothie, 1 CNC, and 1 Stardawg (dog). The smoothie are the two bigger ones in the back of the tent. Now, the Smoothie from FastBuds is just killin it right now. Since I popped the beans they have done nothing but show signs of greatness. I don’t think this one is gonna slow down much either. I’m going to push these plants harder than my last harvest. I had a really really amazing harvest last time. I was even able to pull sap out of all 4 plants. 2 Zkittles and 2 LSD-25. This was all done by feeding at the right times and keeping a “moist” soil. Also I want add that I ran pretty much the entire line of Nectar for the Gods at a little less then the recommended ratios. This time I plan on going a tiny bit over the recommended ratios just to see what these plants will do. Trust me, if the plants have a bad response I will go back to the recommended ratios. The reason I want to do this is because I really think these auto strains can handle a lot more than a regular flowering cycle plant would. They can handle more stress, that’s for sure. When do you think I should add a compost tea into my regimen? Soon or wait till the plant is a little larger?
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Performed the "back building" technique this week to help bulk up the top cola. Watering the soil when dry, and defoliating the dry-dying fan leaves.
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9/10 Went and shook the plants off. I don't think it rained. I think it's just dew. Plants with ailments seem to be progressing well and it looks like they'll outrun the pathogens. It may not be a banner year yield wise but the quality will be great it looks like. GMO is stacking up real nice. The ones in further flower are swelling more and more everyday. Earwigs MAY be back because I noticed a couple of plants where I left a tiny little branch on the bottom have been lollipopped on tje sherb pie and rather quickly too. I suppose it could be leaves dieing and rotting bit I doubt it. If they are here there aren't many and most plants are too far in flower for them to bother. They eat the lower newly developing shoots. Not big dense buds. Luckily. I noticed some pm on the gmo with pm. Looks like it's time for another treatment of k bicarb. I'll probably do that tonight. I'll keep this updated. WENT BACK OVER AND DEFOLIATED A BUNCH OF STUFF. ITS TIME FOR ANOTHER APP OF K BICARB. I CHECKED THE SHERB PIE AND IT DOESNT NEED TO BE WATERED. IT WAS STILL VERY HEAVY. IM THINKING I MAY HAVE EARWIGS THAT ARE FEASTUNG ON LOWER BRANCHES THAT SHOULDVE BEEN PRUNED. I NOTICED SOME LARFY SHIT THAT KOOKS LIKE NEW SHOOTS WERE CHEWED. LUCKILY THEY DONT SEEM TO BOTHER DEVELOPED BUDS. ESPECIALLY ROCK HARD BUDS. I'LL DO SOME RESEARCH AND DO SOME FORM OF APPLICATION FOR THE PM SPOTS I SAW AND THE SEPTORIA I KNOW IS THERE. IM SUPER GRATEFUL THOUGH. THESE ARE VERY HARD TO GROW STRAINS AND I THINK ILL KNOCK IT OUT OF THE PARK. Also thinking of switching to cha ching shortly on the toasted toffy and the event horizon that's furthest along. 9/11 I Didn't water anything today because things still seemed heavy. I'm noticing the same thing that happened a few years back. Lower secondary or tertiary branches are getting stripped on a couple plants. They never touch the developed buds they want the new shoots. If IT IS ear wigs they are impossible to fight. I put poison down and d.e. around those plantscand we'll see. It could also be rot from dying leaves. I need to treatcsome of the plants with a longer flowering time with plant doctor. I'm going over today to spend a few hours working in the garden. I'll apply something I just don't know WHAT yet. One event horizon looks like it tried to reveg AGAIN which is super weird . I just see a lot of one and 3 finger leaves. It will probably turn out to be great. The other event horizon looks like its going to be incredible. The toasted toffy is getting close too. Temps only reached 62° yesterday. It took FOREVER to shake these plants off. Time to get the leaf blower out. I'm going to bring my trich scope when I go over today. I wanna look at tgat event horizon. Pistols are retracting on the top flowers. This may be a multiple stage harvest. I'll keep this updated. UPDATE: WENT OVER AT FOUR AND WATERED. I MIGHTVE BEEN ABLE TO HOLD OFF UNTIL TOMORROW MORNING BUT I HAVE PLANS EARLY MORNING. I ALSO DEFOLIATED QUITE A BIT. BUDS ARE SWELLING CONSIDERABLY. THE SHERB PIE HAS TURNED COMPLETELY PURPLE. IT HASNT HAD ANY FLOWERS ON IT BUT NOW IT HAS FLOWERS BIGGER THAN A QUARTER! THESE PLANTS ARE VIGEROUSLY FLOWERING. I NEED TO CHECK THE TRICHS ON A COUPLE PLANTS AS THEY DONT HAVE MUCH TIME LEFT. AS I WAS DEFOLIATED I NOTICED THAT SOMWTHING HAD STRIPPED FRESH BUDSITES ON SOME LOWER BRANCHES. IN YEARS PAST THATS ALWAYS BEEN EAR WIGS WHICH ARE IMPISSIBLE TO DEAL WITH. THEY USUALLY DONT TOUCH THE BIG BUDS THOUGH. TJEY LIKE THE FRESY SHOOTS. ILL GO OUT AT NIGHT AND SEE IF THIS IS THE CASE. ITS ONLYVHAPPENING ON A COUPLE PLANTS BUT STILL. THE EVENT HORIZON IN THE MIDDLE IS GROWING DIFFERENT THAN ITS SISTER. YOU CAN TELL THE STRAIN IS THE SAME BUT THIS SEEMED TO REVEG (AGAIN) BECAUSE IM SEEING SMALL FULLY DEVELOPED BUDS THAT I DONT REALLY SEE CONNECTING. CRAZY TRICHS THOUGH. IT WILL BE INTERESTING TO SEE HOW IT COMES OUT. I TREATED THE GMO WITH WPM WITH A QTR GALLON OF K BICARBONATE FOLIAR SPRAY WITH A DROP OF DAWN FOR A SURFICANT. 9/12 Shook everything off and then used the leaf blower to try to better dry them. Weather is lookingvyo be good for the next couple weeks. Perfect finishing weather for my two that are furthest in flower. I may have to do a staged harvest. Some BOTTOM branches on e.h. are FAT and have trichs on trichs. I'll have to use my scope. I'm switching to cha ching next feed for the three furyhest in flower. Maybe four. The sherb pie had NO flowers last week but it's exploding with really compact buds. The whole plant turned purple. I need to be careful of botrytis with this weather. I've been pretty good about leaving and removing any dead or dying leaves. Even the plant in the ten is filling out nice. I have SOMETHING (behaving like earwigs) and eating "fresh" shoots. It's like lollipopping the new growth on a couple plants. I'll becstaying at the grow from now forward so I'll go out tonight and see what I found. The poison I put down seems to be gone. Anyway I'm very grateful for what I've got. I'm update as I go. 9/13 It's sprinkling a half hour trom my grow. I think it's supposed to be nice though. I found some botrytis on two plants. Two are so close to finishing that I need to closely watch them. I don't want botrytis. I applied k bicarb to the middle gmo as I saw a spot of pm. I spent a ton of time defoliating. This cold weather has brought the fade much faster. Trichs are looking good. WENT THROUGH THE PLANTS AND DEFOLIATED A SHIT TON. APPARENTLY THIS EARLY FADE IS NORMAL THIS YEAR. AT LEAST IN ALL MY CANNABIS GROUPS. WENT THROUGH EVERYTJING! STILL HAVE THE MIDDLE EVENT HORIZON I WANT TOO TIE DOWN BUT I DID A LOT OF DEFOLIATION. THIS ALLOWED ME TO FIND A FEW PIECES OF BOTRYTIS. ON MY PLANTS THAT ARE ALMOST DONE. WE HAVE GOOD WEATHER FOR A LITTLE BIT BUT I MAY HAVE REACHED DIMINISHING RETURNS ON A COUPLE. THAT E.V. AND THE TOASTED TOFFY I DONT WANT GETTING WET. THEY ARE TOO DENSE. TRICHS ARE ALL MILKY AND THEYRE SWELLING. IM SLEEPING ON IT BUT IM ALMOST POSITIVE IM GOING TO DO A SELECTIVE HARVEST ON THOSE TWO. IM NOT LETTI G SHIT ROT AND AGTER LOOKING AT THESE UNDER A SCOPE I WOULDS TAKEN THEM YEARS AGO. GMO IS FROSTY AS HELL. EXTREMELY ARONATIC GARDEN. ILL KEEP THIS UPDATED. Decided to hold off feeding and watering. Defoliated a shit ton throughout the day. Around five I noticed that my shittiest GMO with the yellow leaves had a couple dead interior branches. Upon closer inspection it looked like grey mold. A few tiny buds were destroyed but the branch needed to be removed. Jot any big loss but if it's in the shit that doesn't matter than it's around the shit that does. Found info on event horizon flowering time. Middle of September until middle of October. That could be why I'm seeing coke cans on the bottom branches of that phenome. I've got some decisions to make. I mixed up enough water to water in the morning. I'll mix up feed in the morning. Tje garden has gotten a lot of attention lately. I hope it pays off. I'm leaning on a multi staged harvest of the event horizon amd toasted toffy but we'll 9/14 Hurries morning. Mixed water for this morning last night. WATERED AND FED EVERYTHING (BUT TOASTED TOFFY AND EVENT HORIZON #2 DUE TO THEM BEING CHOPPED SOON.) Everything got a gallon of water and a qtr of food. I had to cut a couple small interior secondary branches on my shottiest GMO due to the appearance of grey mold. I also found some botrytis in both the event horizon and toasted toffy that I plan to take the tops of today. I scoped them and I'm planning to do a staged harvest. Trichs are milky with some amber. Everything is blowing up! I'm not sure what's happening but like it previous years there's a couple plants with leaves dieing near bud sites and an overall yellow appearance. Maybe it's late stage septoria. I cant isolate it due to local laws but if I have to I'll deal with it. Nothing else had anything like that. I hace noticed SOMETHING nocturnal that can eat a small branch and leave it bare. Also eat the small newly forming shoots at the bottom of plants. I shouldve taken off ALL the larfy stuff as it draws bugs but I did things a like different with each plant this year. I'm going to go through the plants again today and I'll update what I decide. Chances are the top half of those two plants are coming down. I'll do a video. 9/15 I'll have to add pics and videos tomorrow. Last night I did a final check of the trichs on event horizon #2 and toasted toffy. Everything looked great so I proceeded to do a "wet trim" outside (ill use the leaf blower to clean up) and cut the tops off the plant. I know this injures tje plant but it also makes them go crazy thinking they are dying and the buds and trichs swell. I had one plant last year I got two harvests off and a bunch of fresh frozen for concentrates. I looked this morning and I madecthe right decision. These plants are DONE. I've got another event horizon but it's not quite there yet. I'm going to leave it as long as I can. If the injured plants pick up pm or something (already had septoria) then the flower will be used for extracts or I'll do a Cervantes wash. I imagine concentrates though. One GMO isn't doing as good as the rest. Yesterday I had to cut three branches off due to grey mold on the stalk. If laws allowed it I'd isolate that plant. Luckily since I spend so much time going through the garden I'm able to find this kind of stuff. The GMO'S look wonderful (even the one with some yellow leaves that I cut the branches off) . K bicarb has kept pm at bay so far. This strain has TONS of trichs. It's like trich on trich on trich. I can't wait to try it. It smells amazing. Sherb pie is completely purple with rock hard buds that smell amazing. It's quality over quantity this year. The big one in the 50 (I think red runtz) is swelling more everyday. I'm going to switch to ch ching soon. The plant in the 10 had TOTALLY SUPRISED ME. I've never grown a plant lime this. It started out with dark purple in the middle now buds are swelling and calyxes are EVERYWHERE! This plant is growing extremely fast! You'll see what I mean when I put the pics and the videos up. I'm not going to do the event horizon harvest until I get both plants and all of both plants. It will be a while before I finish the toasted toffy one as well. 9/16 I'm glad I took those plants. Weather is good but plants were soaked thos morning. I need to go out at night and see what is eating new shoots. Flowers are looking great. I need to do another app of k bocarb sometime. I'm suprised the pm has pretty much stayed with that one plant. That two other GMO's flanking it are doing awesome! Purple, sticky stinky. It's got the whole package. The one in the 50 has some huge flowers that won't require much longer. The one invthe 10 has some time left. This is clearly a sativa dominant hybrid. The buds are swelling like crazy. It went from NO buds to having little purple calyxes to flowers that look like cat-tails! I can't wait to see what rhis year brings. Once I get things dry and manicured I'll give you guys a look at how the first stage of the first harvest went. I'm super happy. Spent a large part of this morning shaking plants by handcand removing any dead leaves or anything that could cause rot then I went over them with a leaf blower. I'll need to water tonight I imagine. WATERED AROUND 3:00 PM. MY FAVORITE GMO STARTED DROPPING. WATERED EVERYTHING A GALLON EXCEPT I SPLIT ONE GALLON ON THE PLANTS THAT HAD BEEN CUT. IM EXTREMELY TIRED BUT I NEED TO GO OUT AT NIGHT AND SEE IF I CAN FIND EARWIGS CRAWLING UP THE STALKS. WEATHER STILL LOOKS GOOD. BUDS SWELLING PISTOLS RETRACTING AND MORE AND MORE LEAVES DYING. I CANT BELIEVE THE SIZE OF THAT SATIVA LEANING HYBRID IN THE TEN!
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We start week 3 of bloom!! Goofiez 2 amor compound genetics it’s the champions!!
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@Pokerdud
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Die Pflanze hatte etwas Hitze Stress und Wassermangel aber wird sich denke ich gut erholen. Sonst die Buds sehen sehr gut aus und werden immer größer und kompakter bzw. schließen sich gut zusammen. Heute ca. beginnt die 6 Blüten Woche.
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Transplanted into 3 gallon pots a little early only because my initial starter pots didn't have any fertilizers in it besides earth worm casting noticed a fade from dark to light green fixed it with some fish poop and they were back to good health overall there looking good
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Buds a swealling. The smell got very interesting the last few days. Resine production is insane . Trichomes are almost all milky 5% amber . Flash starts today. I'm planning to harvest in 10 days.
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11.11, die Pflanzen wachsen im Vergleich zu meinem Outdoor-Grow fantastisch. Ich bin überrascht, wie schnell es unter diesen Bedingungen voran geht. Die Lampe wurde ein wenig höher gehängt und läuft jetzt auf 75%.Gedüngt wurde mittlerweile auch. 1ml/L Biogrow von BioBizz. EDIT DAY 10 Lampe hängt jetzt 30cm über den Pflanzen. Day 14 Topping Day 15 braune Flecken auf der Zkittlez
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Welcome to my Fast Buds sponsored shootout and living organic soil v coco side by side. I also plan to use this grow to my full advantage regarding a few age old nagging questions about methods. I have had a keen interest in L.O.S ( supersoil) since reading a few threads a while back on how amazing and productive it can be. After too much research and procrastinating I had to give it a go. I have been a decades coco/nft grower and recently threw my hat in the rdwc ring too. I have avoided soil due to the overwatering worry ( heavy handed chimp brain !) and the best potting soil/feeds. Catching up on the advances in indoor soil gardening and organics led me too subcools supersoil recipes to name a few but being a town dweller with farms everywhere around me still drew blanks on a lot of the ingredients needed and where the hell I could even begin to get them from. Thankfully , commercial savvy has now made buying it in ready to use and with a full range of beneficial bacteria ect available in amendments from a grow shop here in the uk. ecothrive have realised the potential for us to dive into this medium with all the mixing , measuring and resourcing. I bit the bullet and £150 later I now have 4 x37Litre pots that will be used for as long as I want to feed the soil for without EVER needing nutrients again potentially. The coco has also had charge mixed in to encourage the bennies to colonize there too. I will be using the shogun nutes that I know do the business with coco to compare with for yield , growth and taste. I have 3 seeds each of 4 Fast Buds Strains to use as a control for the grow and am journaling each strain in their own diaries. This statement will be used to start each one as the information is identical at this point but following this I will do them individually. I am now starting their second week since opening the seed packets , straight into soaked and shook root riot cubes and into the heated propagator. They had all showed their heads by end of day 3 and a couple needed helmet surgery to open up without being hindered . I have has them in the prop for a few days but they needed to get settled as they were popping roots out all over the cubes. They have now been in their final pots for 2 days complete and starting their 3rd today at day 8 since planting in cubes. I am impressed with the speed and success of these girls already (12 of 13 germinated) . Well done fast buds. So here we go folks , any comments , ideas ,questions , advice are always welcome and I hope we can have some fun experimenting with defol v non defol , topping v fimming v bending and any other curiosities along the way. I plan on using a quadline for them all to keep a control for the comparisons too. Be green folks Welcome aboard and a huge thank you to Fast Buds for the opportunity to try autos.
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Besides a few leaf spots here and there everything is going smoothly, 2 waterings this week, one with just PH'd and 3ml of cal-mag water, the other with the mentioned nutes, around a half gal each watering( first time I actually used my growbig). When I've been watering, I've been going off pot weight, so no set schedule. Doing half strength compared to what fox farm suggested because of the soil still holding nutes. Going to bump it up to normal strength the coming week. I turned the light intensity down for a few days to 70%ish. I thought this might help with some stretch and the discolored tips. I went ahead and did some major defoliation this time around compared to last time as well with the goal of narrowing down my bud sites/colas. I also ended up just snipping off the FIM'd tip as it was very scrawny and funky looking. So far I'm very happy with this strain(I have nothing to compare it to lol), but I know it's time to switch to flowering in a week, two tops. Just going to keep taking my time with her and making sure we have a happy plant, not a rushed one. As always I'd love to hear from the community on what you guys think. Thank you and God Bless
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ANTHOCYANIN production is primarily controlled by the Cryptochrome (CR1) Photoreceptor ( !! UV and Blue Spectrums are primary drivers in the production of the pigment that replaces chlorophyll, isn't that awesome! 1. Diverse photoreceptors in plants Many civilizations, including the sun god of ancient Egypt, thought that the blessings of sunlight were the source of life. In fact, the survival of all life, including humans, is supported by the photosynthesis of plants that capture solar energy. Plants that perform photosynthesis have no means of transportation except for some algae. Therefore, it is necessary to monitor various changes in the external environment and respond appropriately to the place to survive. Among various environmental information, light is especially important information for plants that perform photosynthesis. In the process of evolution, plants acquired phytochrome, which mainly receives light in the red light region, and multiple blue light receptors, including his hytropin and phototropin, in order to sense the light environment. .. In addition to these, an ultraviolet light receptor named UVR8 was recently discovered. The latest image of the molecular structure and function of these various plant photoreceptors (Fig. 1), focusing on phytochrome and phototropin. Figure 1 Ultraviolet-visible absorption spectra of phytochrome, cryptochrome, phototropin, and UVR8. The dashed line represents each bioactive absorption spectrum. 2. Phytochrome; red-far red photoreversible molecular switch What is phytochrome? Phytochrome is a photochromic photoreceptor, and has two absorption types, a red light absorption type Pr (absorption maximum wavelength of about 665 nm) and a far-red light absorption type Pfr (730 nm). Reversible light conversion between the two by red light and far-red light, respectively(Fig. 1A, solid line and broken line). In general, Pfr is the active form that causes a physiological response. With some exceptions, phytochrome can be said to function as a photoreversible molecular switch. The background of the discovery is as follows. There are some types of plants that require light for germination (light seed germination). From that study, it was found that germination was induced by red light, the effect was inhibited by subsequent far-red light irradiation, and this could be repeated, and the existence of photoreceptors that reversibly photoconvert was predicted. In 1959, its existence was confirmed by the absorption spectrum measurement of the yellow sprout tissue, and it was named phytochrome. Why does the plant have a sensor to distinguish between such red light and far-red light? There is no big difference between the red and far-red light regions in the open-field spectrum of sunlight, but the proportion of red light is greatly reduced due to the absorption of chloroplasts in the shade of plants. Similar changes in light quality occur in the evening sunlight. Plants perceive this difference in light quality as the ratio of Pr and Pfr, recognize the light environment, and respond to it. Subsequent studies have revealed that it is responsible for various photomorphogenic reactions such as photoperiodic flowering induction, shade repellent, and deyellowing (greening). Furthermore, with the introduction of the model plant Arabidopsis thaliana (At) and the development of molecular biological analysis methods, research has progressed dramatically, and his five types of phytochromes (phyA-E) are present in Arabidopsis thaliana. all right. With the progress of the genome project, Fi’s tochrome-like photoreceptors were found in cyanobacteria, a photosynthetic prokaryotes other than plants. Furthermore, in non-photosynthetic bacteria, a homologue molecule called bacteriophytochrome photoreceptor (BphP) was found in Pseudomonas aeruginosa (Pa) and radiation-resistant bacteria (Deinococcus radiodurans, Dr). Domain structure of phytochrome molecule Phytochrome molecule can be roughly divided into N-terminal side and C-terminal side region. PAS (Per / Arndt / Sim: blue), GAF (cGMP phosphodiesterase / adenylyl cyclase / FhlA: green), PHY (phyto-chrome: purple) 3 in the N-terminal region of plant phytochrome (Fig. 2A) There are two domains and an N-terminal extension region (NTE: dark blue), and phytochromobilin (PΦB), which is one of the ring-opening tetrapyrroles, is thioether-bonded to the system stored in GAF as a chromophore. ing. PAS is a domain involved in the interaction between signal transduction-related proteins, and PHY is a phytochrome-specific domain. There are two PASs and her histidine kinase-related (HKR) domain (red) in the C-terminal region, but the histidine essential for kinase activity is not conserved. 3. Phototropin; photosynthetic efficiency optimized blue light receptor What is phototropin? Charles Darwin, who is famous for his theory of evolution, wrote in his book “The power of move-ment in plants” published in 1882 that plants bend toward blue light. Approximately 100 years later, the protein nph1 (nonphoto-tropic hypocotyl 1) encoded by one of the causative genes of Arabidopsis mutants causing phototropic abnormalities was identified as a blue photoreceptor. Later, another isotype npl1 was found and renamed phototropin 1 (phot1) and 2 (phot2), respectively. In addition to phototropism, phototropin is damaged by chloroplast photolocalization (chloroplasts move through the epidermal cells of the leaves and gather on the cell surface under appropriate light intensity for photosynthesis. As a photoreceptor for reactions such as escaping to the side of cells under dangerous strong light) and stomata (reactions that open stomata to optimize the uptake of carbon dioxide, which is the rate-determining process of photosynthetic reactions). It became clear that it worked. In this way, phototropin can be said to be a blue light receptor responsible for optimizing photosynthetic efficiency. Domain structure and LOV photoreaction of phototropin molecule Phototropin molecule has two photoreceptive domains (LOV1 and LOV2) called LOV (Light-Oxygen-Voltage sensing) on the N-terminal side, and serine / on the C-terminal side. It is a protein kinase that forms threonine kinase (STK) (Fig. 4Aa) and whose activity is regulated by light. LOV is one molecule as a chromophore, he binds FMN (flavin mononucleotide) non-covalently. The LOV forms an α/βfold, and the FMN is located on a β-sheet consisting of five antiparallel β-strands (Fig. 4B). The FMN in the ground state LOV shows the absorption spectrum of a typical oxidized flavin protein with a triplet oscillation structure and an absorption maximum wavelength of 450 nm, and is called D450 (Fig. 1C and Fig. 4E). After being excited to the singlet excited state by blue light, the FMN shifts to the triplet excited state (L660t *) due to intersystem crossing, and then the C4 (Fig. 4C) of the isoaroxazine ring of the FMN is conserved in the vicinity. It forms a transient accretionary prism with the tain (red part in Fig. 4B Eα) (S390I). When this cysteine is replaced with alanine (C / A substitution), the addition reaction does not occur. The effect of adduct formation propagates to the protein moiety, causing kinase activation (S390II). After that, the formed cysteine-flavin adduct spontaneously dissociates and returns to the original D450 (Fig. 4E, dark regression reaction). Phototropin kinase activity control mechanism by LOV2 Why does phototropin have two LOVs? Atphot1 was found as a protein that is rapidly autophosphorylated when irradiated with blue light. The effect of the above C / A substitution on this self-phosphorylation reaction and phototropism was investigated, and LOV2 is the main photomolecular switch in both self-phosphorylation and phototropism. It turns out that it functions as. After that, from experiments using artificial substrates, STK has a constitutive activity, LOV2 functions as an inhibitory domain of this activity, and the inhibition is eliminated by photoreaction, while LOV1 is kinase light. It was shown to modify the photosensitivity of the activation reaction. In addition to this, LOV1 was found to act as a dimerization site from the crystal structure and his SAXS. What kind of molecular mechanism does LOV2 use to photoregulate kinase activity? The following two modules play important roles in this intramolecular signal transduction. Figure 4 (A) Domain structure of LOV photoreceptors. a: Phototropin b: Neochrome c: FKF1 family protein d: Aureochrome (B) Crystal structure of auto barley phot1 LOV2. (C) Structure of FMN isoaroxazine ring. (D) Schematic diagram of the functional domain and module of Arabidopsis thaliana phot1. L, A’α, and Jα represent linker, A’α helix, and Jα helix, respectively. (E) LOV photoreaction. (F) Molecular structure model (mesh) of the LOV2-STK sample (black line) containing A’α of phot2 obtained based on SAXS under dark (top) and under bright (bottom). The yellow, red, and green space-filled models represent the crystal structures of LOV2-Jα, protein kinase A N-lobe, and C-robe, respectively, and black represents FMN. See the text for details. 1) Jα. LOV2 C of oat phot1-to α immediately after the terminus Rix (Jα) is present (Fig. 4D), which interacts with the β-sheet (Fig. 4B) that forms the FMN-bound scaffold of LOV2 in the dark, but unfolds and dissociates from the β-sheet with photoreaction. It was shown by NMR that it does. According to the crystal structure of LOV2-Jα, this Jα is located on the back surface of the β sheet and mainly has a hydrophobic interaction. The formation of S390II causes twisting of the isoaroxazine ring and protonation of N5 (Fig. 4C). As a result, the glutamine side chain present on his Iβ strand (Fig. 4B) in the β-sheet rotates to form a hydrogen bond with this protonated N5. Jα interacts with this his Iβ strand, and these changes are thought to cause the unfold-ing of Jα and dissociation from the β-sheet described above. Experiments such as amino acid substitution of Iβ strands revealed that kinases exhibit constitutive activity when this interaction is eliminated, and that Jα plays an important role in photoactivation of kinases. 2) A’α / Aβ gap. Recently, several results have been reported showing the involvement of amino acids near the A’α helix (Fig. 4D) located upstream of the N-terminal of LOV2 in kinase photoactivation. Therefore, he investigated the role of this A’α and its neighboring amino acids in kinase photoactivation, photoreaction, and Jα structural change for Atphot1. The LOV2-STK polypeptide (Fig. 4D, underlined in black) was used as a photocontrollable kinase for kinase activity analysis. As a result, it was found that the photoactivation of the kinase was abolished when amino acid substitution was introduced into the A’α / Aβ gap between A’α and Aβ of the LOV2 core. Interestingly, he had no effect on the structural changes in Jα examined on the peptide map due to the photoreaction of LOV2 or trypsin degradation. Therefore, the A’α / Aβ gap is considered to play an important role in intramolecular signal transduction after Jα. Structural changes detected by SAXS Structural changes of Jα have been detected by various biophysical methods other than NMR, but structural information on samples including up to STK is reported only by his results to his SAXS. Not. The SAXS measurement of the Atphot2 LOV2-STK polypeptide showed that the radius of inertia increased from 32.4 Å to 34.8 Å, and the molecular model (Fig. 4F) obtained by the ab initio modeling software GASBOR is that of LOV2 and STK. It was shown that the N lobes and C lobes lined up in tandem, and the relative position of LOV2 with respect to STK shifted by about 13 Å under light irradiation. The difference in the molecular model between the two is considered to reflect the structural changes that occur in the Jα and A’α / Aβ gaps mentioned above. Two phototropins with different photosensitivity In the phototropic reaction of Arabidopsis Arabidopsis, Arabidopsis responds to a very wide range of light intensities from 10–4 to 102 μmol photon / sec / m2. At that time, phot1 functions as an optical sensor in a wide range from low light to strong light, while phot2 reacts with light stronger than 1 μmol photon / sec / m2. What is the origin of these differences? As is well known, animal photoreceptors have a high photosensitivity due to the abundance of rhodopsin and the presence of biochemical amplification mechanisms. The exact abundance of phot1 and phot2 in vivo is unknown, but interesting results have been obtained in terms of amplification. The light intensity dependence of the photoactivation of the LOV2-STK polypeptide used in the above kinase analysis was investigated. It was found that phot1 was about 10 times more photosensitive than phot2. On the other hand, when the photochemical reactions of both were examined, it was found that the rate of the dark return reaction of phot1 was about 10 times slower than that of phot2. This result indicates that the longer the lifetime of S390II, which is in the kinase-activated state, the higher the photosensitivity of kinase activation. This correlation was further confirmed by extending the lifespan of her S390II with amino acid substitutions. This alone cannot explain the widespread differences in photosensitivity between phot1 and phot2, but it may explain some of them. Furthermore, it is necessary to investigate in detail protein modifications such as phosphorylation and the effects of phot interacting factors on photosensitivity. Other LOV photoreceptors Among fern plants and green algae, phytochrome ɾphotosensory module (PSM) on the N-terminal side and chimera photoreceptor with full-length phototropin on the C-terminal side, neochrome (Fig. There are types with 4Ab). It has been reported that some neochromes play a role in chloroplast photolocalization as a red light receiver. It is considered that fern plants have such a chimera photoreceptor in order to survive in a habitat such as undergrowth in a jungle where only red light reaches. In addition to this, plants have only one LOV domain, and three proteins involved in the degradation of photomorphogenesis-related proteins, FKF1 (Flavin-binding, Kelch repeat, F-box 1, ZTL (ZEITLUPE)), LKP2 ( There are LOV Kelch Protein2) (Fig. 4Ac) and aureochrome (Fig. 4Ad), which has a bZip domain on the N-terminal side of LOV and functions as a gene transcription factor. 4. Cryptochrome and UVR8 Cryptochrome is one of the blue photoreceptors and forms a superfamily with the DNA photoreceptor photolyase. It has FAD (flavin adenine dinucle-otide) as a chromophore and tetrahydrofolic acid, which is a condensing pigment. The ground state of FAD is considered to be the oxidized type, and the radical type (broken line in Fig. 1B) generated by blue light irradiation is considered to be the signaling state. The radical type also absorbs in the green to orange light region, and may widen the wavelength region of the plant morphogenesis reaction spectrum. Cryptochrome uses blue light to control physiological functions similar to phytochrome. It was identified as a photoreceptor from one of the causative genes of UVR8 Arabidopsis thaliana, and the chromophore is absorbed in the UVB region by a Trp triad consisting of three tryptophans (Fig. 1D). It is involved in the biosynthesis of flavonoids and anthocyanins that function as UV scavengers in plants. Conclusion It is thought that plants have acquired various photoreceptors necessary for their survival during a long evolutionary process. The photoreceptors that cover the existing far-red light to UVB mentioned here are considered to be some of them. More and more diverse photoreceptor genes are conserved in cyanobacteria and marine plankton. By examining these, it is thought that the understanding of plant photoreceptors will be further deepened.
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Such a fast/strong grower. Minimal training needed.. Thi S I believe is the strain... I'm doing Seedmans - Strawberry Banana and it also has similar structure