Description Prime Ark Freedom is thornless, and a primocane-fruiting blackberry. This is a brand new release from U. of Arkansas – fruiting very early in the season, and will often fruit again in the fall. Exceptional fruit – large size, good flavor, along with heat and humidity tolerance. Self-fertile. Its excellent disease resistance makes it ideal for growing organically. Primocane-fruiting blackberries flower and fruit on the new branches that grow each season.