Select an area to plant the blackberry vines that features full sun with well-drained soil. Dig into the soil to make sure it's black and fertile and not sandy or hard clay.
Dig a hole and plant the first blackberry vine, planting it 1 inch deeper than it was planted in its nursery container. Fill in the hole and pack it down firmly.
Space the trailing vines at least 5 feet apart in the row, but not more than 8 feet. If you're growing upright blackberry varieties along a trellis or fence in a horizontal direction you can reduce spacing to 3 feet between plants. Space rows 6 to 10 feet apart.