Blackberry care guide: when & how to prune, fertilize and spray
Rubus spp. · USDA zones 5–9
Vigorous cane fruit, either upright or trailing. Fruit forms on second-year canes (except primocane types). Summer tipping and winter thinning keep it productive and manageable.
☀️ Sun
Full sun.
💧 Water
1–2 in (2.5–5 cm) a week during fruiting.
🪱 Soil
pH 5.5–7.0. Well-drained. Compost.
How and when to prune blackberry
Winter thinning
When: 2–6 weeks before the last spring frost.
- zones 3–5: about Mar 29 – Apr 26
- zones 6–7: about Mar 4 – Apr 1
- zones 8–10: about Jan 14 – Feb 11
Opens the planting and focuses energy on the best canes.
- Remove any dead canes left from last year.
- Keep 4–8 strong canes per plant (or per 3 ft / 1 m of row).
- Erect types: shorten side branches to 12–18 in (30–45 cm).
- Trailing types: tie canes onto the trellis.
Summer tipping of new canes (erect types)
When: 8–12 weeks after the last spring frost.
- zones 3–5: about Jul 5 – Aug 2
- zones 6–7: about Jun 10 – Jul 8
- zones 8–10: about Apr 22 – May 20
Tipping new canes at 3–4 ft (1–1.2 m) makes them branch, and branches carry next year's fruit.
- Pinch or cut the top 2–3 in (5–8 cm) off new canes once they reach 3–4 ft (1–1.2 m).
Remove fruited canes after harvest
When: 16–20 weeks after the last spring frost.
- zones 3–5: about Aug 30 – Sep 27
- zones 6–7: about Aug 5 – Sep 2
- zones 8–10: about Jun 17 – Jul 15
Canes that just fruited will die. Removing them now reduces disease.
- Cut fruited canes to the ground.
Fertilizing blackberry
Spring feeding
When: from 1 week before to 2 weeks after the last spring frost.
- zones 3–5: about May 3–24
- zones 6–7: about Apr 8–29
- zones 8–10: about Feb 18 – Mar 11
Supports both fruiting canes and new growth.
- Apply a balanced fertilizer and compost around the plants and water it in.
What to use: 🌿 Balanced organic granular fertilizer (e.g. Espoma Plant-tone 5-3-3) · Slow-release balanced fertilizer (e.g. Osmocote Smart-Release 14-14-14)
Common blackberry problems and how to fix them
Orange rust
Signs: Bright orange powdery pustules on leaf undersides.
What to do: Systemic and incurable. Dig out and destroy infected plants.
Blackberry care FAQ
When should I prune blackberry?
Winter thinning: 2–6 weeks before the last spring frost (around Mar 4 – Apr 1 in zones 6–7). Summer tipping of new canes (erect types): 8–12 weeks after the last spring frost (around Jun 10 – Jul 8 in zones 6–7). Remove fruited canes after harvest: 16–20 weeks after the last spring frost (around Aug 5 – Sep 2 in zones 6–7). Vigorous cane fruit, either upright or trailing. Fruit forms on second-year canes (except primocane types). Summer tipping and winter thinning keep it productive and manageable.
What is the best fertilizer for blackberry?
Supports both fruiting canes and new growth. Good options: Balanced organic granular fertilizer (e.g. Espoma Plant-tone 5-3-3); Slow-release balanced fertilizer (e.g. Osmocote Smart-Release 14-14-14).
What soil does blackberry need?
Well-drained. Preferred pH 5.5–7.0. Compost.
How much sun and water does blackberry need?
Sun: Full sun. Water: 1–2 in (2.5–5 cm) a week during fruiting.
What are common blackberry problems?
Orange rust: Bright orange powdery pustules on leaf undersides. Systemic and incurable. Dig out and destroy infected plants.
More fruit care guides
Timings are given relative to your average frost dates, with examples for typical US climates. Always read and follow product labels.