Low chill thornless blackberries are far easier to harvest from than their thorny wild cousins. New ‘primocane’ varieties from U of AR provide high yields on first year canes. Initial plantings appear to be more vigorous than previous ‘floricane’ selections and may prove more hardy and prolific for Florida.
https://askthegreengenie.com/berries-grapes-and-other-vines/thornless-blackberries/