Mine too! At 5 weeks now, but around week 3, I fed them a bit much, some of newer leaves curled a bit, but thankfully never burned beyond the very tips. I have noticed they like the pH a little lower than my previous grow.got 2 pheno's short and tall blackberry just put into flower not nirvana seeds theyre sativa seed bank seeds which iv been told is nirvana watch out tho anyone growin blackberry they dont like feed well mine dont and its been minimal feedin and they crisp up dead easy pics up soon when buds start to fat up