How to Grow Triple Crown Blackberry

Soil, care & harvest

Prepare well-draining soil with a pH between 6.0 and 7.0 to support healthy root development. Since blackberries are perennial shrubs grown from transplants rather than seed in most gardens, you should purchase bare-root or potted plants after the last frost has passed. If starting from seed for breeding purposes, sow indoors roughly eight weeks before your local last frost date at a depth of about one-quarter inch. Expect germination to take between 21 and 30 days if sowing seeds.

Space your plants 4 to 6 feet apart in rows to ensure proper air circulation and fruit production. Install sturdy trellising or canes immediately, as these blackberries require support to grow upright. Provide 1 to 2 inches of water per week using deep watering methods, preferably applying mulch around the base to retain moisture. Feed regularly during the growing season to maintain vigor throughout the late summer harvest period.

Monitor for common pests like spotted wing drosophila, aphids, raspberry crown borers, and Japanese beetles by inspecting canes frequently; use organic controls or netting as needed. Watch for cane blight, verticillium wilt, and rosette disease, practicing good sanitation to prevent spread. Harvest ripe blackberries in late summer when they are fully colored and slightly soft to the touch, picking them carefully to avoid damaging neighboring fruit.