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hinterhofgrowercommentedweek 69 hours ago
I'm still looking for the reasons for the leaf problems in the previous grows. I now think that it's a combination of several factors and I'm trying to solve the problems one by one.
1. Too much fertilizer for the Ca (78 mg/l) + Mg 22 mg/l present in the tap water (16°dH). Signs of over-fertilization and CalMag deficiency.
2. Too high pH, resulting in light green leaves at the new growth at the beginning of flowering. I suspect an iron deficiency, like with my rhododendrons.
3. Too intense light, resulting in dry buds and leaves in the upper part of the plants
After I adjusted the amount of fertilizer and the light intensity, the over-fertilization symptoms were not as severe, there was still the pH value, which could cause the iron deficiency.
I regularly tested the pH value with the usual yellow test strips. They are usually yellow-green, hence pH 6.5. I have now added vinegar essence (25% acetic acid) to the watering water. The test strips are now yellow, pH 6. Let's see if that helps.
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