Never before has there been a thornless, primocane-fruiting (a new cane on a bramble fruit (as a blackberry or raspberry) that will flower and fruit the following year) blackberry! Prime-Ark offers exceptional fruit size and flavor combined with disease resistance and tolerance of heat and humidity. You'll get crops early in the season, and where the climate is right, a second flush of fruit in the fall. Reaches 5 to 6 ft. at maturity.