Blackberry Ribes 'Little Black Sugar' Black - BioExtra cool: Grow your own berries in the garden. Make delicious juice or jam from the blackberry 'Little Black Sugar' (Ribes nigrum). The berries are large and have a lovely sweet taste. And they are full of vitamins and minerals. The fruit bush blossoms in the spring. With small, inconspicuous flowers. A crop will be ready to harvest from summer onwards in the second year after planting. Prune the shrub in winter, but not when it is freezing.