Rubus ‘Chester’ Thornless Blackberry Description Chester is the hardiest thornless blackberry. It produces very large, high-quality berries, up to 1" long, with exceptional flavor. The berries stay firm on the canes longer than most varieties. Chester is disease resistant and self fertile. Characteristics Hardiness Zone: 5 Light requirements: Sun Height: 4-8' Spread: 4-6' Native: No Sizes & Prices Size: 18" Ht $29.98 Other Information All Blackberry Thornless Blackberry Rubus 'Black Satin' Zone: 5 Sun HT: 5-7' Thornless Blackberry Rubus 'Chester' Zone: 5 Sun HT: 4-8'