Blackberry (Rubus) Reuben Delicious blackberries like no other! This Blackberry produces fruit like no other variety and is sweeter than a strawberry! With berries weighing up to 11g, each measuring up to 4.5cm in length, a fully mature plant can yield up to 7 x 500g punnets of fruit! A Super self-fertile primocane fruits on space-saving, upright canes and first years growth so you can enjoy crops even sooner after planting, usually 8-12 months, best yields 20-24 months.