How to Grow Blackberry

Growing guide

Overview

Blackberry is a perennial fruiting cane that produces heavy crops of sweet-tart berries from midsummer onward. It’s a beginner-friendly plant because it’s vigorous and forgiving once established, and thornless types make picking far easier. Give it full sun, moderate water, and a trellis, and it will fruit for 15 to 20 years.

Soil & planting prep

Blackberries grow best in loamy, well-drained, acidic soil with a pH around 5.5 to 6.5. Work in compost before planting and make sure the site drains well—standing water kills the roots. Space plants 4 to 6 feet apart in rows 8 to 10 feet apart, and set them at the same depth they grew in the nursery pot.

When to plant

Plant dormant blackberry canes in early spring, about 2 to 4 weeks before your last frost date, so roots establish while the soil is cool and moist. In mild-winter zones you can also plant in late fall after the canes go dormant. Avoid planting during the heat of summer, which stresses new roots.

How to plant

1. Choose a full-sun site with well-drained, acidic soil and install a trellis or wire fence before planting.
2. Dig a hole twice as wide as the root ball and set the plant so the crown sits at or just below the soil line.
3. Backfill with native soil mixed with compost, firm gently, and water deeply to settle the roots.
4. Space plants 4 to 6 feet apart in the row, with 8 to 10 feet between rows for airflow and picking.
5. Cut the canes back to 6 inches tall after planting to encourage strong new growth from the crown.

5 common mistakes to avoid

• Planting in poorly drained soil—blackberries rot in soggy ground, so plant on a raised bed or mound if drainage is questionable.
• Skipping the trellis—uncontrolled canes flop, get diseased, and make picking miserable, so install support before the canes grow.
• Pruning at the wrong time—if you cut all canes to the ground each year you remove next year’s fruit, so only remove canes after they finish fruiting.
• Letting the patch get overcrowded—too many canes shade each other and invite disease, so thin to 4 to 6 strong canes per plant each year.
• Fertilizing with high-nitrogen products—this pushes leafy growth and few berries, so use a balanced or low-nitrogen fertilizer in early spring only.

Harvesting & storage

Pick berries when they turn fully black and pull off the cane with a gentle tug—if they resist, they’re not ripe. Harvest every few days during the season and chill berries soon after picking. Store them dry in the refrigerator for up to a week, or freeze them on a tray for longer keeping.

Companion planting

Good companions include clover and other low-growing legumes that fix nitrogen, plus chives or garlic to help repel pests. Avoid planting near nightshades like tomatoes and peppers, which can share verticillium wilt.

Growing in containers

Blackberries can grow in containers if you use a 15-gallon pot or larger with drainage holes and a trellis or stake for support. Use a well-drained acidic potting mix, water regularly, and prune canes to keep the plant manageable.

Pro tips

Plant in full sun with a trellis or fence for support. Canes fruit in year two (primocanes grow year one, floricanes fruit year two). Prune out canes that have fruited. Thornless varieties like Triple Crown are much easier to manage.