first year for growing blackberries(triple crown)these things are huge(no berries though).growing on 30' wires 9'tall. do i need to cover them or prune them. any suggestions? thanks Jim
if your zone 6 is like my zone 6, then you need to do nothing. This year you grew primocanes, next year they will send forth new growth and be floracanes (which means you get berries)
I seem to get a windstorm each fall which tucks my leaves neatly into the beds I use for blackberries, raspberries and currants. I just leave (pun intended) well enough alone after that and I've not had any problems.
No - blackberries are extremely cold hardy.
Do cut out the canes that have already borne fruit - they are done after they bear once.
From everything I have recently read, a late fertilization (now, early september) is a good idea and don't worry about adding some nitrogen in Fall.
Do you have any references to the late fertilization thing? What is the objective behind it?