Care of BlackBerry Plant:
Once the bushes are established, there is very little blackberry plant care needed. Water regularly; provide an inch (2.5 cm.) of water per week depending upon weather conditions. Allow 3-4 new canes per plant to grow to the top of the training wire or trellis. Keep the area around the plants free of weeds. In the first year of growing blackberry bushes, expect to have a small batch of fruit and a full harvest in the second year. After you see ripened fruit, try picking blackberries every three to six days. This prevents the birds from getting the berries before you do. Once the fruit has been harvested, prune out the fruiting canes which will not produce again. Fertilize new plants once new growth appears with a complete fertilizer such as 10-10-10 in the first year. Established plants should be fertilized before new spring growth emerges.