To begin, fill the bucket with water from the hose and place the roots of the blackberries into the water. Let the roots soak for two hours. While roots are soaking, dig a hole slightly wider than the roots of the blackberry plants. Prune canes to desired height in the fall this will make them more productive in their second year and will also make them more attractive and give them larger berries. After the harvest, each cane that produced fruit should be pruned to the ground to enhance the next year's production, side canes should be pruned away, and mulch should be placed around the roots of each blackberry plant. In early spring, cut each branch to between 12 15 inches for a more flavorful, larger fruit. In mid spring, remove all weak or stunted canes to channel energy to fruit bearing canes.