Triple Crown pruning
I live in Atlanta, Ga and I planted a 3 year old Triple Crown from a pot on June 15 of this year, I've pruned off the old limbs on July 5 that just fruited and now I'm left with 1 new can about 5' long, It's not growing very fast and I'm not sure when I should tip the top off to start the laterals growing. I have plenty of trellis and would like to let it grow 10'+ but I don't know when it will stop growing this year and I want to give plenty of time for good length laterals.
Another question, if a new lateral grows from this 5' long cane next spring will it fruit? or does my laterals need to be established before winter and pruned back to 20" just before spring?