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420keef started grow question 4 years ago
My leafs turn yellow very fast sometimes with dark almost black spots on them is that normal? And what can i do about it?
Bagseed Kush (first grow ever)
10 weeks
Bagseed Kush (first grow ever) 420keef
Unknown Kush
6 comments · 4 years ago
Resolved
Week 11
Leaves. Color - Dark-brown
Stick answered grow question 4 years ago
Your PH should be between 6.2 to 6.5, from seedlings to harvest ! Your non-adjusted tap water may have affected your plants. But more than a PH related problem, this looks like a nitrogen deficiency. I also use Biobizz nutrients and never experiment a deficiency like that but I would recommend you to use "BioHeaven" which should increase nutrients absorption and globally enhance plant energy. The dosage is 1.5 ml per liter of water, starting at the second week of growth and ending at least 2 weeks before the harvest. You could also try to add a very small amount of BioGrow, something like 0.5ml/L if your harvest is not planned for the next 3-4 weeks. Finally, a couple of questions to better understand your situation : how often do you give them nutrients? And how often do you give them plain PHd water ? How many liters do you give to each plant and at what frequency? I'll be around, good luck with this beauty!
Jeff123fish answered grow question 4 years ago
Sulfur deficiency as it can be very common during flowering.

http://loudclouds.co/wp-content/uploads/2016/07/marijuana-deficiency-chart-jorge-cervantes.jpg
Removed answered grow question 4 years ago
Yellowing on the while leaf or more the top off the leaf? The first is nitrogen deficiency (add 1 ml of biogrow as biobizz feed chart suggests) probably due the extra N needed in the stretch phase.
The spots are like rust spots or more dark or metallic blue? The first is potassium deficiency (same as above 1 ml of biogrow should help) the later is phosphorous deficiency (up the dose of biobloom)