Not sure about the runoff pH, but the water you give 'em should be about 6. You can adjust this easily.

If you can find a soil test kit, I'd buy it and test your current soil pH and NPK.
Dorje113 Reviewed by Dorje113 on . Fert burn or K deficiency? Hello growers! :) This is my first post here in this great forum. I've been reading a lot and started my first grow, and until now I had no problems. Last week two of my plants started to develop burn tips on some of my lower leaves. It quickly spread to most of the leaves, some with more intensity and others with less. I read a lot and saw loads of pictures of problems and deficiencies, but could not deicide if this is a Nute Burn or some kind of deficiency (Potassium?). It's hard Rating: 5