Simply cut back any old dried canes, lopping them off at ground level. During the summer, the bushes produce delectable fruit for about three or … Blackberries require plenty of moisture, especially when growing and ripening. To combine it with mowing, mow the blackberry bushes in the fall; then apply triclopyr during the next growing season in late summer. I water once a week unless I get an inch in the form of rain. In the second year, the canes fruit and die. Ensure plants receive one inch of water per week and more in hot temperatures. How to Care for Blackberries. Blackberry bushes may be erect or trailing. I just put the hose next to the base of the plants and I let it … You can find them wild all over the country in zones 5-9. Wild blackberry plants can live for 25 years or longer. Apply it several weeks before the bushes enter dormancy to give the herbicide time to reach the roots and kill the bush. Keep a thick layer of mulch surrounding plants at all times. Plant your blackberries close to a water source, as they will most likely need extra irrigation. Sever a 4- to 10-inch-long piece of young, pliable wood from the tip of a side branch growing from a healthy, wild blackberry bush, using the bypass pruners. They produce vines that arise from a central crown or from buds that form along rhizomes. Mulching is important throughout the season to conserve moisture and suffocate weeds. Fertilize, and water when the plants need it. Make the cut at a 45-degree angle. Watering the plants while the berries are developing makes for larger, juicier berries. Blackberries are a native plant in the U.S., which is one reason they are so hardy. If you happen to have wild black raspberry volunteers in a convenient spot, you can tame them by cleaning them up a bit. Plant your blackberry plants from December through February. Although most blackberries produce shoots with thorns, many cultivars are thornless. 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