Looks to me like overwatering causing root-rot... (black splotches near/on new growth, chlorosis of entire plant, extreme yellowing of undergrowth) ...and a possible ph issue.

What is the ph of your rainwater? (likely way too acidic)

Are you in-ground or in pots?
Rusty Trichome Reviewed by Rusty Trichome on . What is this? Clones Outdoors Moisture plus potting soil mixed with old compost. Stoped nutes because I thought they may be causing this, water from rain barrell. Used bloom booster when I first noticed buds, but stopped 3-4 weeks ago, not on all parts of plants, some areas not affected. 3 out of 4 clones from same person has this, theirs does too. It just does not look right and it seems to be stunting the buds. Plants from seeds right beside this has no signs of the darkness. Advice please, Rating: 5