This is my first ever grow! so here we grow...
All I know is by searching the net and I think I got the idea but time will tell.
I am trying out a product Veganixs made in Australia that has been proven reliable nutrient/root booster in the Nimbin area most of the OZ greenheads know what/where that is.
It is sold on their website and ebay.
I have grown a few blackberrys in the past, different breeders to yours. I have done photos and autos and I found them to be quite picky on nutrients. Most the plants looked like yours at that stage. Only a few plants looked different. Could be due to the genetics. Unless your seeing shiny leaves, brown spots or anything else I wouldn't worry. One thing I did find with blackberry is they really got nitrogen build up quite quickly. Try increasing your P and K a bit and see if that has any positive development.
Saintist
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