Peony care guide: when & how to prune, fertilize and spray
Paeonia lactiflora · USDA zones 3–8
Long-lived perennial with spectacular late-spring flowers. It needs a cold winter, shallow planting, and fall cutback to control botrytis. (Tree peonies are woody, so don't cut them to the ground.)
☀️ Sun
Full sun, 6+ hours.
💧 Water
Moderate.
🪱 Soil
pH 6.5–7.5. Rich, well-drained. Plant with eyes (buds) no deeper than 2 in (5 cm). Planting too deep means no flowers.
How and when to prune peony
Deadhead after flowering
When: 7–10 weeks after the last spring frost.
- zones 3–5: about Jun 28 – Jul 19
- zones 6–7: about Jun 3–24
- zones 8–10: about Apr 15 – May 6
Removes spent flowers before they rot or set seed, while keeping the leaves to feed the roots.
- Cut faded flowers back to the first strong leaf. Leave the foliage standing all summer.
Cut to the ground in autumn
When: from the first fall frost to 3 weeks after.
- zones 3–5: about Oct 1–22
- zones 6–7: about Oct 25 – Nov 15
- zones 8–10: about Dec 1–22
Botrytis overwinters on peony stems and leaves, so removing them is the best prevention.
- After frost blackens the foliage, cut all stems to 1–2 in (3–5 cm).
- Bag or trash the debris rather than composting it.
Fertilizing peony
Light feeding
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
Peonies need little. A light feeding or compost as shoots emerge is enough.
- Top-dress with compost or a low-nitrogen fertilizer, keeping it off the crown.
What to use: 🌿 Finished compost or composted manure · 🌿 Low-nitrogen, high-phosphorus feed (e.g. bone meal or 5-10-10)
Spraying & disease prevention for peony
Botrytis prevention (wet springs)
When: from 1 week before to 2 weeks after the last spring frost, then every 2 weeks (2 times a season).
- zones 3–5: about May 3–24
- zones 6–7: about Apr 8–29
- zones 8–10: about Feb 18 – Mar 11
Botrytis attacks emerging shoots and buds in cool, wet weather.
- Spray emerging shoots and the crown with copper or a biofungicide if spring is wet or you had botrytis last year.
What to use: 🌿 Copper fungicide (e.g. Bonide Captain Jack's Liquid Copper) · 🌿 Bacillus-based biofungicide (e.g. Serenade or Cease) · Chlorothalonil (e.g. Daconil Fungicide)
Other care for peony
Set up supports
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
Heavy blooms flop in the rain. Grid supports must go in while shoots are short.
- Place a peony ring or grid over the clump while shoots are 6–12 in (15–30 cm) tall, so stems grow up through it.
Common peony problems and how to fix them
Botrytis blight
Signs: Buds turn black and fail to open; stems collapse.
What to do: Cut stems to the ground in fall and remove the debris. Improve airflow. Copper or biofungicide as shoots emerge in wet springs.
Ants on buds
Signs: Ants crawling on buds.
What to do: Harmless. They're eating nectar. Rinse cut flowers.
No flowers
Signs: Healthy leaves, no buds.
What to do: Planted too deep, too much shade, or recently moved.
Peony care FAQ
When should I prune peony?
Deadhead after flowering: 7–10 weeks after the last spring frost (around Jun 3–24 in zones 6–7). Cut to the ground in autumn: from the first fall frost to 3 weeks after (around Oct 25 – Nov 15 in zones 6–7). Long-lived perennial with spectacular late-spring flowers. It needs a cold winter, shallow planting, and fall cutback to control botrytis. (Tree peonies are woody, so don't cut them to the ground.)
What is the best fertilizer for peony?
Peonies need little. A light feeding or compost as shoots emerge is enough. Good options: Finished compost or composted manure; Low-nitrogen, high-phosphorus feed (e.g. bone meal or 5-10-10).
What should I spray on peony?
Botrytis prevention (wet springs) (from 1 week before to 2 weeks after the last spring frost). Products: Copper fungicide (e.g. Bonide Captain Jack's Liquid Copper); Bacillus-based biofungicide (e.g. Serenade or Cease); Chlorothalonil (e.g. Daconil Fungicide). Always follow the label.
What soil does peony need?
Rich, well-drained. Preferred pH 6.5–7.5. Plant with eyes (buds) no deeper than 2 in (5 cm). Planting too deep means no flowers.
How much sun and water does peony need?
Sun: Full sun, 6+ hours. Water: Moderate.
What are common peony problems?
Botrytis blight: Buds turn black and fail to open; stems collapse. Cut stems to the ground in fall and remove the debris. Improve airflow. Copper or biofungicide as shoots emerge in wet springs. Ants on buds: Ants crawling on buds. Harmless. They're eating nectar. Rinse cut flowers. No flowers: Healthy leaves, no buds. Planted too deep, too much shade, or recently moved.
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.