CANNA PK USE 🤔🤔

in soilless context, should jsut be giving ~60 ppm P and 180-200 ppm K the whole time. the plants needs all of these molecules at all times in a particular ratio. That ratio may change at times but not as much as most believe. withholding p/k then overdosing it at soem point in flower isn't going to have the effect that people perpetuate. if you looked up what atoms constitute the cells and what produces these pretty complex molecules we care about (cannibanoids et al), you'll see it isn't pur K or P. The plant needs a well-balanced diet at all times even if less N is needed after leaf growth and stem elongation ceases, because planty of bits still need N or molecules with N in it as a building block. Nucleic acids in DNA is one example. i feed 120-130 ppm N in vege and slowly drop closer to 100-110 over 3-4 weeks of flower. Very little else needs to change. The plant dictates and plants act in similar ways most of the time. if your mileage varies in that way, it is a sign of an esoteric nutrient formula that isn't as good as advertised. A lot of these fertilizer manufacturers catering to marijuana growers ignored existing knowledge and did their own thing, and it shows. There's a reason why the nutes that follow the science are all very similar (soilless/hydro context). master blend, jacks nutrients, pro line of athena (3x expensive for no reason), southern ag and others all have a product this is virtually identical becaue it's based off the same research and knowledge that undoubtedly is better than any extrapolation someone cna make just growing some plants and not systematically observing and measuring outcomes while comparing to a baseline to guage effect of whatever it hypothesis is being tested. ... not .. "i added this p k and things turned out awesome, buddy.. for sure.. i have nothing to compare it to but if i did something that hand no effect my ego couldn't handle it" lol. there are so many unsubstantiated myths in this "culture" it is downright hilarious.

If you are asking for canna pk13/14 specifically ? As opposed to just general pk boosters as pk13/14 is used slightly different to most. It should be used for one week only but it’s alao suggested for longer at a much lower dose. They are all a bit different but I think the numbers (amount and ratio) dictate whether it’s for 1 week only or start to finish. Trial and error but best bet is to do as they say + get info online. Some will say it’s not needed but if in coco with synthetics then maybe you should. All the old school growers I know used to swear by canna a&b and pl13/14 week 5 only

I usually start giving them a light taste when it starts stretching, and increase slowly till bulking and it is the main nutrition in the feed then.

It says on the bottle 3 weeks from harvest (which I presume you know) I have been trying to find the best time going on visuals not a number. Through trial and error I’ve found that when the buds have taken a bit of shape is best. They start off like buttons sort of then into balls then they start coning so to say. This is best time. The pistils will still be white, just before the pistols start swelling from the bottom. Usually week 5. As you have an auto it’s tricky so visually is the best way. Only give for one week tops. I then add top shooter by house and garden for last 3 week. That stuff makes em push more pistils which essentially grows buds on buds

I'd say now. As the plant is moving or past pre flower you can give extra PK. When the buds are done swelling. You'll enter ripening. This is when you should be nearly completely off or very low N with higher Pk. As if the plant needs N, a perfect grow would take what little N is needed in the last stages of ripening it'll draw it from fan leafs giving a lovely fade with light yellowing behind the fade. But you can give your basic bloom right until the end. But after pre flower (upwards growth of nodes) is over you can then add ur pk booster

Are the stems red? If not maybe they have enough PK, why u think u need to add PK? In my opinion longer dry soil periods wil help