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evergreenstash started grow question 4 years ago
Don't know why does it keep on turn into yellow from old leaves, also it affected tips of younger leaves for now. Looks like i need something to do with it, but i don't know what, so some suggestions and advices needed.

Thanks
Jack Herer
18 weeks
Jack Herer evergreenstash
Jack Herer
21 comments · 4 years ago
Resolved
Week 12
Leaves. Color - Yellow
Stick answered grow question 4 years ago
Hi there! Hard to say with your last pictures, but my guess is that you overfed your plants with too many nutrients and inappropriate pH, resulting in a nutrients lockout. Your plant is now unable to absorb nutrients (could be Potassium, Magnesium or Iron..) and she responds with those signs, asking for help! As for an example, 3ml/L of BioGrow during week 11 is way too much! BioGrow intakes should have stopped right after the stretch ended. She only needs BioBloom+TopMax+BioHeaven if possible. Also, your babies might suffer from pH fluctuations. Why did you apply a 6.8 pH for this last week? You should stick to a 6.0-6.5 range. Now, as an emergency move, I would flush the soil for a couple of days, with plain pH'd water (~6.3), let the soil dry between each waterings, and see how it goes. I'll be around, keep us up-to-date, and happy growing!
midEastern answered grow question 4 years ago
Hey sport.you are mixing too much nitrogen. Dont use biogrow from now.she needs more PK when flowering and not N.
make sure to dry soil before watering.feel pot weight.
Looking good.i wouldnt worry
DenDv1d answered grow question 4 years ago
Any chance you're overwatering? All upper leaves should be reaching for the sky/light, if you have one of those soil moisture meters, see what reading you get and if you get a "high moisture" reading even after skipping 1 or 2 days, skip watering entirely until the soil is pretty much dried out and the plants are praying for a drink again.
ShaggyGrower answered grow question 4 years ago
They look a little nute-burned so back off the nutrients for a week and just feed either plain water or a very low ppm/ec (300ppm/0.6ec) solution of BioBloom. Week 4 of flower she will be stopping stretching so won't need the Nitrogen in her feed which by the looks of it is causing an issue. Also, lower your ph a little to 6.3-6.4. The yellowing of lower older fan leaves is the plant cannibalizing older leaves and older leaves just getting to the end of their life (stem fan leaves, being the oldest, are the first to start dying and going yellow).
Removed answered grow question 4 years ago
Yellowing patches, specially near the tip with rust spots and margins is a sign of Potassium deficiency.
If you look closely, you can see some clawed leaves up top.
I think you have Nitrogen toxicity, due too much biogrow this late in the flowering stage and either potassium deficiency, due lockout or too little biobloom.
What you can do is a flush a little, to wash the excess Nitrogen, and feed bloom and top max only.
DudeGrowsWeed answered grow question 4 years ago
I don’t see the yellow leaf tips in the pics. But that can be a sign of nutrient burn. Maybe try backing down on the nutes. Also, the older leaves under the canopy turning yellow is kind of normal and usually nothing to worry about.