Peony
Paeonia lactiflora
A very long-lived perennial that resents disturbance and is almost always failing to flower for one reason: it has been planted too deeply. The buds must sit within about 3 cm of the surface, and a peony buried at the depth that suits most perennials will produce leaves for decades and never bloom.
- Position
- Full sun or Partial shade
- Water
- moderate demand
- Drainage
- Moisture-retentive, Free-draining
- Grows to
- 60–100 cm × 60–100 cm
- Hardiness
- H7
- Flowers
- May and June
- Difficulty
- Some care needed
Described view
A peony crown positioned with its buds just below the soil surface, beside one planted too deeply
August
Nothing to do
No sowing, planting, harvesting or pruning window falls in August.
Coming next month: plant.
Peony’s year
Resolved for United Kingdom (general). Every window is stored against a climate event rather than a date, so a late frost pocket runs later than the band shows. What else August calls for.
| Activity | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Plant | March. | September. | October. | November. | ||||||||
| In flower | May. | June. | ||||||||||
| Prune | October. | November. |
Timing that travels
The band above resolves this plant's windows into months for one region. These are the windows themselves, stored against a climate event rather than a date — which is the form that survives being carried to a colder garden, a frost pocket, or next year.
Conditions it needs
- Light
- Full sun, Partial shade
- Frost
- Very hardy
- Hardiness rating
- H7 (RHS)
- Grows best at
- 10–25 °C
- Soil
- Loam, Clay
- Soil pH
- 6–7.5
- Drainage
- Moisture-retentive, Free-draining
- Water needs
- moderate
- Drought
- moderate tolerance
- Waterlogging
- poor tolerance
- Heat
- moderate tolerance
- Wind and exposure
- moderate tolerance
Where these figures come from
- LightSourced guidancemoderate confidence
- Royal Horticultural Society: Peony — position
Checked 2026-08-13
- FrostSourced guidancehigh confidence
- Royal Horticultural Society: Peony — hardiness
Checked 2026-08-13
- Hardiness ratingSourced guidancemoderate confidence
- Royal Horticultural Society: RHS hardiness ratings
Checked 2026-08-13
- Grows best atSourced guidancemoderate confidence
- Royal Horticultural Society: Peony — temperature
Checked 2026-08-13
- SoilSourced guidancemoderate confidence
- Royal Horticultural Society: Peony — soil
Checked 2026-08-13
- Soil pHSourced guidancemoderate confidence
- Plant Finder — Missouri Botanical Garden: Paeonia lactiflora — culture
Checked 2026-08-13
- DrainageSourced guidancemoderate confidence
- Royal Horticultural Society: Peony — soil
Checked 2026-08-13
- Water needsHorticultural consensusmoderate confidence
No external citation — see the evidence type above.
Checked 2026-08-13
- DroughtHorticultural consensusmoderate confidence
No external citation — see the evidence type above.
Checked 2026-08-13
- WaterloggingHorticultural consensusmoderate confidence
No external citation — see the evidence type above.
Checked 2026-08-13
- HeatHorticultural consensusmoderate confidence
No external citation — see the evidence type above.
Checked 2026-08-13
- Wind and exposureHorticultural consensusmoderate confidence
Heavy double flowers need staking in wind and rain.
No external citation — see the evidence type above.
Checked 2026-08-13
On your soil
Computed by comparing this plant's recorded requirements against each soil's recorded characteristics. A recorded horticultural fact overrides the comparison where GrowingHQ holds one.
| Soil | Verdict | Why |
|---|---|---|
| Heavy clay | Works, with one condition | Peony will crop on heavy clay, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse. |
| Sandy | Grows well here | Peony grows perfectly well on sandy without special measures, though it is not the soil it would choose. |
| Chalky and alkaline | Grows well here | Peony grows perfectly well on chalky and alkaline without special measures, though it is not the soil it would choose. |
| Loam | Prefers this soil | Loam suits Peony as it stands: The pH suits it: it wants 6 to 7.5, and this soil is in that range. The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering. |
| Silty | Prefers this soil | Silty suits Peony as it stands: The pH suits it: it wants 6 to 7.5, and this soil is in that range. The free drainage is exactly what it wants. The soil holds moisture, which saves a great deal of watering. |
| Peaty and acid | Works, with one condition | Peony will crop on peaty and acid, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse. |
| Shallow over rock | Prefers this soil | Shallow over rock suits Peony as it stands: The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. |
| Made ground and urban soil | Works, with one condition | Peony will crop on made ground and urban soil, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse. |
Not sure which you have? Four hand tests will settle it.
Space and spacing
- Mature height
- 60–100 cm
- Mature spread
- 60–100 cm
- Rooting depth
- 45 cm
- Spacing
- 75–100 cm apart
Where these figures come from
- Mature heightHorticultural consensusmoderate confidence
No external citation — see the evidence type above.
Checked 2026-08-13
- Mature spreadHorticultural consensusmoderate confidence
No external citation — see the evidence type above.
Checked 2026-08-13
- Rooting depthHorticultural consensusmoderate confidence
No external citation — see the evidence type above.
Checked 2026-08-13
- SpacingSourced guidancemoderate confidence
- Royal Horticultural Society: Peony — spacing
Checked 2026-08-13
In a container
- Minimum volume
- 30 litres or more
- Minimum depth
- 45 cm
Where the container figures come from
- Minimum volumeHorticultural consensusmoderate confidence
- Royal Horticultural Society: Peonies — cultivation
Checked 2026-08-13
- Minimum depthHorticultural consensusmoderate confidence
- Royal Horticultural Society: Peonies — cultivation
Checked 2026-08-13
A poor container subject and worth saying plainly: peonies are deep-rooted, long-lived and resent disturbance, and a plant that takes three years to settle is being asked to do it in a volume that dries out and freezes. If you try, use the largest pot you can manage with loam-based compost, keep the buds no more than 3–5 cm below the surface, and leave it entirely alone for years.
Where and how you can grow it
Each way of growing is assessed separately, and “not assessed” is a real answer rather than a gap we have filled in with a guess.
| Method | Suitability | What it needs |
|---|---|---|
| Open ground | Well suitedsourceSourced guidancemoderate confidence
Checked 2026-08-13 | |
| Raised bed | Well suitedsourceSourced guidancemoderate confidence
Checked 2026-08-13 | |
| Container | MarginalsourceSourced guidancemoderate confidence
Checked 2026-08-13 |
Growing it
- PlantingPlant shallowly. The growth buds on the crown should sit within about 3 cm of the soil surface — deeper than that and the plant grows perfectly well and does not flower, which is the commonest peony complaint there is.
- SupportGet supports in place before the buds open. Fully double flowers hold rain and flatten themselves, and a hoop put in afterwards never looks right.
- TransplantingMove an established peony only if you must, and expect it to sulk for two or three years before flowering again. They are among the longest-lived perennials in a garden and are best left where they are.
- WateringWater a newly planted peony through its first two summers and an established one only in a serious drought — they are long-lived, deep-rooted plants that resent disturbance and largely look after themselves. Water at the base rather than over the foliage, because wet leaves and crowded growth encourage peony wilt. The one thing that genuinely matters is planting depth rather than water: the buds must sit no more than 3–5 cm below the surface, and a peony planted too deep will grow leaves happily and never flower, which is the commonest complaint about them by a wide margin.
- FeedingA light dressing of a balanced or high-potash fertiliser in early spring as the red shoots appear, and again after flowering. Keep it off the crown itself. Avoid high-nitrogen feeds and avoid mulching over the crown — both encourage leaf at the expense of flower, and burying the buds is the same mistake as planting too deep. An established clump that has stopped flowering has usually been buried gradually by years of mulch, or has been shaded out by something that grew up around it.
Where this guidance comes from
- PlantingSourced guidancehigh confidence
- Royal Horticultural Society: Paeonia — planting depth
Checked 2026-08-13
- SupportSourced guidancemoderate confidence
- Royal Horticultural Society: Paeonia — support
Checked 2026-08-13
- TransplantingSourced guidancehigh confidence
- Royal Horticultural Society: Paeonia — division
Checked 2026-08-13
- WateringSourced guidancehigh confidence
- Royal Horticultural Society: Peonies — cultivation
Checked 2026-08-13
- FeedingSourced guidancehigh confidence
- Royal Horticultural Society: Peonies — cultivation
Checked 2026-08-13
What goes wrong
| Problem | How often | Notes |
|---|---|---|
| Peony wilt | commonsourceHorticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13 | Individual shoots collapse at ground level in a wet spring. |
| Planted at the wrong depth | commonsourceHorticultural consensusmoderate confidence No external citation — see the evidence type above. Checked 2026-08-13 | A crown buried deeper than 3cm makes excellent foliage and no flowers. |
Sources for this page
GrowingHQ editorial synthesis · Plant Finder · Royal Horticultural Society
Each figure on this page carries its own citation, under the “where these figures come from” note in its section. Record last reviewed 2026-08-14.
If something is wrong with it
- Healthy growth but no flowers — 3 causes GrowingHQ holds for peony
Something else? Work through it with the diagnostic tool.