Blackberry plants are simple to plant and grow but can also spread unwanted vines over other plants in your garden. Caring for and controlling blackberry vines in necessary for also protecting the blackberries that grow on your plant. Each year new vines or canes will grow and can live for two years. The vines will produce leaves in their first year and bear fruit in the second year. It’s important to prune the vines when they grow in areas that you don’t want. Trailing vines can be controlled by wires, as upright canes typically do not require as much pruning or control because they grow straight up.
Apply mulch to the blackberry plant to control the growth of the vines during the first year of plant growth. For example, your mulch can consist of hay, dead leaves, grass clippings and wood chips.
Prune using pruning scissors or gardening shears during the second year of growth when berries fruit in the summer. Cut off any unwanted canes and vines after you have harvested the fruit.
Support upright blackberry plants to grow around posts by attaching a 6-foot tall wooden post to the stem of the plant. Tie the wood to the plant tightly with rope so that wind or animals can not loosen the wood. If you have trailing vines, continue to Step 4.
Use a wire trellis system to control trailing vines. You can purchase such wire at your local garden store or nursery. Prune the portions of the vines that you want gone, and the wrap the wire around the vine to control the growth.
Continue to mulch in winter climates and cover the area around where the vines are growing. The vines can grow extremely long during the winter season, so you should cut the vines back at least 8 to 10 feet during the late winter.