like stinkyattic said, if your plants are on concrete get them off of it. that stuff gets cold! only feed once a week in soil. blueberry gets leaf twist not the claw. i'd say you have nitrogen toxicity. i've only had real claw problems when growing sativas.
Bongojaz Reviewed by Bongojaz on . LEAF CLAW MYSTERY AT BUD SITE *** background 1. Soil, just got water PH from 7 to 6.5, was at 7 when problem started, cold at night 60, avg 68 to 73 day,plants over two months old, organic nutrients, water every third day, 1000 watts, problem started at 1 week into 12, now after 2 weeks into 12 hours and problem is getting worse in some, better in others and the same in others. almost no sign of mites i have tried to water less since the first signs. if i manipulate the leaf, try to uncurl them, they will curl Rating: 5