Plant Baby Cakes® Dwarf Thornless Blackberry in full sun with well-drained soil. Space plants 3-4 feet apart. Water regularly, especially during dry spells, to keep the soil consistently moist. Fertilize in early spring with a balanced fertilizer. Prune in late winter or early spring, removing dead or weak canes and cutting back lateral branches to 12 inches. Provide support with a trellis or stake if needed. Protect from extreme cold with a cover or by moving containers indoors. Harvest berries when they are fully black and easily detach from the plant.