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The way the leaf stems are reddish-purplish-brown, the blotchy-ness and the way the leaf tips on older leaves are turning dark and curling up are all symptoms of a rapidly progressing phosphorus ("P") deficiency. Phosphorus deficiencies are pretty common. They are misdiagnosed a lot too. Phosphorus deficiencies are often caused when the PH is above 7. Phosphorus isn't able to be absorbed by the roots properly when the PH is above 7.
Watering every 2-3 days and only feeding your plant(s) every other watering coupled with the PH on the higher side of acceptable PH range for marijuana growth is what's caused your plant(s) to have become deficient in phosphorus, in my opinion.
Fertigate your plants with a complete organic blooming fertilizer that contains phosphorus and lower the PH of your solution to about the 5.5-6.2 range.
Quote: trippinballs420 said: have been watering every 2-3 days when needed with ph 7 water, nutrients every other watering, flushing every 3 weeks now in flowering
what are adjusting your ph to when you feed?
are you using ro, city or well water?
-------------------- "Marijuana may not be addictive, but growing it is" - ED Rosenthal
Maine Caregiver In 100% compliance with Maine state laws.
not really, tho the more i look the more i suspect you're right, and its probably the phosphorus deficiency, the veins turning color first tho is the only thing that doesnt seem to match up with the P deficiency
possible i have 2 deficiencies which is causing the veins to discolor?
Yea, ZINC! When a Zinc deficiency first arrives it will cause black veins to develop on younger leaves. Zinc is needed for the plant to be able to properly utilize phosphorus too. Of all micro-nutrients, Zinc is the most common micro-nutrient found deficient.
Zinc deficiencies are easy to treat. Lower your PH to 5.5 - 6.2 and just flush the growing medium with a light strength mix (1/4th - 1/8th strength nutrient solution) of a complete and balanced fertilizer that has chelated trace elements including zinc, magnesium and iron.
Once you can feed again, keep your PH down to the aforementioned 5.5 -6.2 range, and begin feeding at every watering if you are only watering every 2-3 days.
was about to update....flushed with 6pH water, but they seem to be getting worse, and on higher, newer growth
11/10
11/11
they didnt get flushed until the 10th tho, so hopefully they just havent had a chance to rebound yet....other than the few sketchy looking leaves they look good tho
The damaged leaves aren't going to repair themselves. Might as well go ahead and remove leaves that are 50% damaged and beyond.
You mentioned that you have sprayed your plants with a product called "Mighty Wash" 4 times in the first 3 weeks of flowering to get rid of mites. Are you sure that the fungicide you used wasn't copper based? Copper toxicities can be caused by treating your plants with a copper based fungicide. Copper is highly toxic to marijuana even in very small excess. Iron deficiencies are sometimes linked to an excess of copper too.
We over looked your water source as well. Too much chlorine in your plants' water can cause all kinds of nasty problems to occur. Most municipal water sources have chlorine. Do you take any measures to de-chlorinate and or oxygenate your plants' water before watering your plants? A good leeching with properly PH'ed water should have treated the aforementioned toxicities unless your properly PH'ed water has toxic levels of chlorine in it. If you let your tap water sit out overnight in a reservoir for 24 hours stirring it occasionally the excess chlorine in the water will volatize out of the water and into the atmosphere.
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