Rubus fruticosus The first everbearing thornless blackberry on the market in the Czech Republic: a true game-changer. Suitable for container growing: thanks to its upright, short canes and striking giant flowers, it also has high ornamental value. Fruits from August until frost, and even longer in foil tunnels. If the lower part of the fruited primocane shoot is left over winter, a second crop is possible the following season as early as July (so-called double-cropping).