Check the winners The Grow Awards 2026 🏆
Start My Diary
Start My Diary
Log In
Start My Diary
Home
Diaries
Strains
Shorts
Questions
Contests
Growers
Seeds
Breeders
Nutrients
Equipment
Blog
English
Log In
Sign Up
Following
Follow
Brands
&
Growers
to get updates
Back to Grow Questions
CO2 and PPFD
DutchGuy01
started grow question 3y ago
Grow schedule per week: Which CO2 ppm in relation with light PPFD?
Solved
Other. General questions
likes
DutchGuy01
answered grow question 3y ago
Posted new question
likes
Complain
Selected By The Grower
Ctrellis90
answered grow question 3y ago
Generally only use co2 if you're using HPS bulbs because of the amount of heat stress they put your plants under.
1 like
Complain
Ctrellis90
answered grow question 3y ago
Co2 correlates with temperature not light conditions. 85-90 degrees F. 1200-1500 ppm co2
1 like
Complain
Similar Grow Questions
Solved
Eddjack
Le mando un fioritura?
Sono quasi alla 4 settimana vorrei portarle in fioritura ma ho paura che sia troppo presto . Non vorrei aspettare troppo se poi si allungano troppo? Ho un box da 140cm posso arrivare fino a 1 metro .cosa faccio ? Vado o aspetto un altra settimana ?
Other. General questions
Plant. Too short
5y ago
1
1
Solved
Kourtney80
Gender
Can someone help me with this gender please🙂
Other. General questions
6y ago
5
Solved
Dmarley
Wanneer beginnen tellen
Ik had een vraag waar ik niet direct het antwoord op vind. Wanneer begint met de weken te tellen van jullie kweek? Wanneer is bv de eerste dag.mvg
Week 2
Other. General questions
4y ago
1
2
Solved
Muskrat
Coco Coir Watering
1st time coco coir: How does 500 ml of water for a 5 liter grow bag sound? Significant other and I tested with a 4th bag to try to get a feel for how much water impacts the weight of the bag and the amount of run-off water. We felt confident, but here for 2nd opinions, advice.
Other. General questions
Feeding. Schedule
Feeding. Other
3y ago
3
2
Solved
Calais
Feminized seed turned Male
I bought a 10 pack of feminized seeds and one plant has turned male, this is the first time in 14 years this has happened, could somebody shed some light on to why this has happened? Thankyou
Other. General questions
5y ago
3
4
Solved
xardas1977
Time to switch to flowering?
Do you think its time to switch to flowering or need some more time? Thank you
Other. General questions
5y ago
5
5
Solved
Dpablos
Are they ready?
Hello guys! So what do you think are they ready to harvest the next week? I couldn't check the trichomes yet but the all of the hairs are oranged so that's why I think they are good to go. Tell me what you think, how much time do they have. When should I start flushing. Thanks
Week 9
Other. General questions
6y ago
2
2
Solved
Sweetie420
First Sun Then under The lamps?
Hi When i put my plants outside on The Sun,can i put Them later under The lamps? Im worry that they will not be on time beacouse in The end of October its not anymore Good temperature outside Thanks Guys 😘
Other. General questions
6y ago
1
1
Solved
Idontknowhow
Harvest yet or wait?
I could use some advice please you lovely bunch of people: should I do it tomorrow? The weather is getting cold with daily tops 15C downs 2-3C. I am not sure If first is it ready enough to harvest? Is the weather going to affect it? What is worst harvesting too late or too early?
Week 7
Other. General questions
5y ago
1
1
Solved
leefy770
Deep freezing fresh bud
Hey guys and gals.so I just harvested a batch of granddaddy OG from purple capers and I’m waiting on a harvest right freeze dryer? I vacuum sealed and put the bag in my deep freezer is this OK storage for freshly harvested bud I’m only leaving it in there for about five days?
Other. General questions
5y ago
3
3
Solved
UpInSmoke420
Flushing
With flushing.. can I just feed her PhD water for the next week then harvest? Or is it best to put her in the bath and flush with like 3/5gallons of PhD water then harvest a week or so later?
Other. General questions
6y ago
2
2
Solved
ItalianDesertBalcony
Is she ready for harvest? Or what is my next step?
Is she ready for harvest? I’m thinking no, but close and I should check her every day. Yes, my pathetic 1st attempt growing, & I respect the advice given to me to give up & start over, I want to finish to harvest for the learning experience of the whole process.
Buds. Other
Other. General questions
Techniques. Other
1y ago
3
6
Solved
HappySkunk
Will she get fatter?
Will the buds fatten up more or is this as thick as she’ll get? Perfectly content, just don’t wanna chop her too soon if there’s some time by the end of her life where the buds blow up. 😇 In week 11 flower - strain is supposed to be 9-10 weeks flower. Trichs not amber yet.
Week 15
Buds. Other
Other. General questions
6y ago
1
1
Solved
Moro_Callejero
120x240 cm for 19 plants?
When I take the fan off the ground, is it enough space 120x240 cm for 19 plants? I am open to space-use or any other suggestions... Grow love!
Other. General questions
5y ago
1
2
Solved
spirttomb
Are my plants sativa or indica?
Are my plants mostly sativa or indica? I grew two f1 strains with low stability and the two phenos are very different. I think they both look like mostly sativa hybrids, due to their structure. They are on week 4 curious about your opinions. Both of them are Red Mandarin. Thanks!
Other. General questions
Plant. Other
6y ago
1
1
Solved
Smokey89
Favourite strains
Ok guys what are the best strains you have grown and why?
Other. General questions
5y ago
4
Solved
Surutra
Checking trichomes
When the time comes to start checking the trichomes in a fewish week's time, would the picture from my cell phone be sufficient or should I get something better?
Week 10
Other. General questions
6y ago
5
5
Solved
Mikewithgreenthumbs420
What’s going on have 3 weeks left but this clone matures really quick almost no more white hairs
Have 3 weeks left or so till harvest but the bottom leaves keep dying more every other day any taughts about harvesting soon Here are some pictures of what’s happening to this or is this normal since it’s almost done
Leaves. Curl up
Leaves. Dropping off
Other. General questions
5y ago
2
Solved
Simsim
Need your help for LED
Hi guys, i need your help 🙏 I have to upgrade my led, wich one is the best for a 2x2 (60cmx60cm) growtent ? So what do you think of : - Optic Led Phatslim 1Xl 104w x2 - Optic Led Gmax 150 x2 - Mars hydro FC3000 - SF Se3000 - Lumatek Attis 200 Thank youuu ! 🙏
Other. General questions
Setup. Lighting
Setup. Other
5y ago
2
2
Solved
Grow4Releaf
See Alot of nutrients are used by some, looking for insight on TPS-ONE
Tps-one Nutrients were all ive used during my first grow. But I assume I could have gone harder. Is their anyone that uses tps-one that can suggest anything I can add to my feed program for my new grow? Did some upgrading with lights too so I can push alil harder aswell.
Other. General questions
Plant. Other
Feeding. Chemical composition
3y ago
4
3