Perennial salvia care guide: when & how to prune, fertilize and spray
Salvia nemorosa / S. greggii · USDA zones 4–9
Long-blooming, pollinator-magnet perennial. Shearing after each flush brings repeat blooms all summer.
☀️ Sun
Full sun.
💧 Water
Low to moderate; drought-tolerant once established.
🪱 Soil
pH 6.0–7.5. Well-drained; dislikes wet winter soil. None needed.
How and when to prune perennial salvia
Cut back last year's growth
When: from 4 weeks before the last spring frost until the last spring frost.
- zones 3–5: about Apr 12 – May 10
- zones 6–7: about Mar 18 – Apr 15
- zones 8–10: about Jan 28 – Feb 25
Old salvia stems shelter overwintering beneficial insects and protect the crown in winter. Cutting them in late winter clears the way for fresh growth.
- Cut all of last year's dead stems down to just above the new basal growth. For woody S. greggii, cut back by one-third once new growth appears.
- Do it before new shoots get tall, so you don't snip them by accident.
- Leave the cut stems loosely on the ground or in a brush pile for a few weeks so emerging bees can escape, then compost them.
Tools: Bypass pruners or hedge shears
Shear after each flush
When: 8–10 weeks after the last spring frost, then every 6 weeks (2 times a season).
- zones 3–5: about Jul 5–19
- zones 6–7: about Jun 10–24
- zones 8–10: about Apr 22 – May 6
Shearing off faded spikes triggers another round of blooms in 3–4 weeks.
- When most flowers on the spikes have faded, shear the plant back by about a third, just above the new side shoots.
Tools: Hedge shears
Common perennial salvia problems and how to fix them
Powdery mildew
Signs: White powder on leaves.
What to do: Airflow and full sun. Cut back affected stems.
Perennial salvia care FAQ
When should I prune perennial salvia?
Cut back last year's growth: from 4 weeks before the last spring frost until the last spring frost (around Mar 18 – Apr 15 in zones 6–7). Shear after each flush: 8–10 weeks after the last spring frost (around Jun 10–24 in zones 6–7). Long-blooming, pollinator-magnet perennial. Shearing after each flush brings repeat blooms all summer.
What soil does perennial salvia need?
Well-drained; dislikes wet winter soil. Preferred pH 6.0–7.5. None needed.
How much sun and water does perennial salvia need?
Sun: Full sun. Water: Low to moderate; drought-tolerant once established.
What are common perennial salvia problems?
Powdery mildew: White powder on leaves. Airflow and full sun. Cut back affected stems.
More perennials & grasses care guides
Timings are given relative to your average frost dates, with examples for typical US climates. Always read and follow product labels.