I want to add that, as with most blackberries, the floricanes (the berry-producing canes) on "Ouachita" grew last year and the primocanes (canes that are supposed to bear next year) are growing now. Is it possible that I overfertilized and the growth went into making new primocanes, which are growing rather vigorously, and not into berry production? God bless.

chisms:

I doubt that over fertilizing caused lack of flowering. The flower buds for this year would have formed last year. However I won't fertilize more than enough to get the growth you want. Hopefully you will have better luck next year.

Blackberries in zone 8 is Heavy feeder small berries mean plant starving to late to make berries big this year. To have good luck next Fertilize this year so number berry set be high. Next spring when see first flowers Fertilize at that time that make large berries 2012. I've tried to over fertilize black plants in zone 8b can't do it but can put fertilize to close to crown 18 inches from plant let her roll. Miracle Gro is to small snack.

So gater rider2(cool name) if miracle Gro very two weeks is a small snack, then what is a meal?
What is the name/ formula of a good fertilize for brambles.