Choose a disease-free plant from a local nursery. Local nurseries will also offer blackberry varieties that are best for the climate in your area.
Pick a planting site for your blackberries that offers full sun and well-drained soil. Avoid areas with sandy soil or clay. Prepare the soil for planting by eliminating any weeds from the planting site.
Dig a shallow hole, just large enough to accommodate the roots of the plant. Remove any damaged root parts, then spread the root mass and set it the hole. Cover the roots with soil. Pack the soil down firmly to remove any air pockets.
Water the plant thoroughly to settle the soil. If you are planting multiple blackberry plants, repeat Step 3. Space the plants at least 4 feet apart.
Ensure your blackberry plants are receiving an adequate amount of water. The plants need about 1 inch of water a week, and should be watered if rainfall doesn't provide this amount.
Apply mulch in a 3-inch layer around your blackberry plants to help hold moisture in the soil and discourage invasive weeds from taking root. Avoid using cedar mulch.
Prune out any dead or brittle branches by cutting them off at the base.
Harvest berries every three to six days to get the best fruit. Avoid picking the berries when they are wet to extend their shelf life. Do not pull the berries; instead, use a breaking motion to remove the berry from the plant. Keep in mind that ripe berries will be easy to pick.