Growing Blackberries in containers

My progress of growing thornless primocane Prime Ark Freedom, Stark Bros Black Gem and Prime Ark Traveler in 25 gallon containers in the mountains of Southern California at 3850ft. I got the blackberries at www.starkbros.com and I got the pots at Zen Hydro https://www.zenhydro.com/products/gro-pro-premium-nursery-pot-25-gallon