Thornless means fewer and softer thorns - we have not found a fully thornless blackberry yet. Some of the biggest fruit available, up to 1.5" long! Juicy, dark purple, and delicious. Longer shelf life than most blackberries, heat tolerant and fast-growing with high yields. Perennial root system, but each cane (stem) produces fruit in the second year. Needs nutrient-rich soil and full sun for best production.