Wisteria care guide: when & how to prune, fertilize and spray
Wisteria spp. · USDA zones 5–9
Vigorous woody vine with spectacular spring flowers. It must be pruned twice a year (summer and winter) to flower well and stay in bounds. Asian species are invasive in some regions; native American wisteria is tamer.
☀️ Sun
Full sun for flowering.
💧 Water
Moderate.
🪱 Soil
pH 6.0–7.0. Average, well-drained. Don't fertilize. Nitrogen gives leaves instead of flowers. Bone meal can help shy bloomers.
How and when to prune wisteria
Winter spur prune
When: 3–8 weeks before the last spring frost.
- zones 3–5: about Mar 15 – Apr 19
- zones 6–7: about Feb 18 – Mar 25
- zones 8–10: about Dec 31 – Feb 4
Shortening side shoots to stubby spurs makes the plant form flower buds. You can easily tell the fat, round flower buds from slim leaf buds in winter.
- Cut back the side shoots you shortened last summer to 2–3 buds (3–4 in / 8–10 cm) from the main framework.
- Keep the fat, round flower buds; slim, pointed buds are leaf buds.
- Remove tangled, dead or wayward stems, and tie in framework branches.
Summer prune of long whips
When: 10–14 weeks after the last spring frost.
- zones 3–5: about Jul 19 – Aug 16
- zones 6–7: about Jun 24 – Jul 22
- zones 8–10: about May 6 – Jun 3
Cutting back the long green shoots about 2 months after flowering controls growth and helps flower buds form.
- Cut this year's long whippy side shoots back to 5–6 leaves (about 12 in / 30 cm) from the main stem.
- Remove shoots heading toward gutters, siding or into trees.
- Repeat as needed through summer.
Fertilizing wisteria
Phosphorus for flowering (if needed)
When: from the last spring frost to 3 weeks after.
- zones 3–5: about May 10–31
- zones 6–7: about Apr 15 – May 6
- zones 8–10: about Feb 25 – Mar 18
Only for wisteria that won't bloom. Phosphorus without nitrogen can encourage flower buds.
- Scatter bone meal around the base and water it in. Keep lawn fertilizer away.
What to use: 🌿 Low-nitrogen, high-phosphorus feed (e.g. bone meal or 5-10-10)
Common wisteria problems and how to fix them
No flowers
Signs: Lush vine, no blooms.
What to do: Usually too much nitrogen (lawn fertilizer), too much shade, a seed-grown plant, or skipping the twice-yearly pruning.
Wisteria care FAQ
When should I prune wisteria?
Winter spur prune: 3–8 weeks before the last spring frost (around Feb 18 – Mar 25 in zones 6–7). Summer prune of long whips: 10–14 weeks after the last spring frost (around Jun 24 – Jul 22 in zones 6–7). Vigorous woody vine with spectacular spring flowers. It must be pruned twice a year (summer and winter) to flower well and stay in bounds. Asian species are invasive in some regions; native American wisteria is tamer.
What is the best fertilizer for wisteria?
Only for wisteria that won't bloom. Phosphorus without nitrogen can encourage flower buds. Good options: Low-nitrogen, high-phosphorus feed (e.g. bone meal or 5-10-10).
What soil does wisteria need?
Average, well-drained. Preferred pH 6.0–7.0. Don't fertilize. Nitrogen gives leaves instead of flowers. Bone meal can help shy bloomers.
How much sun and water does wisteria need?
Sun: Full sun for flowering. Water: Moderate.
What are common wisteria problems?
No flowers: Lush vine, no blooms. Usually too much nitrogen (lawn fertilizer), too much shade, a seed-grown plant, or skipping the twice-yearly pruning.
More vines care guides
Timings are given relative to your average frost dates, with examples for typical US climates. Always read and follow product labels.