White peonies bring large, fragrant blooms and long-lived structure to a garden or vase. This guide covers planting and caring for garden peonies, plus the basics of keeping cut flowers fresh. Before you begin, identify whether you have a herbaceous, tree, or intersectional peony: planting depth differs, and tree peonies should not be cut back to the ground in fall. Choose a sunny, well-drained spot and plant in fall when possible.
What You’ll Need
- A white peony plant, bare-root division, or container-grown plant from a reputable nursery
- A site receiving at least six hours of direct sun, with fertile, well-drained soil
- Compost or other mature organic matter, if the soil needs improvement
- A spade, watering can or hose, and mulch such as shredded bark or leaf mold
- A peony support ring or stakes for large, heavy-flowered varieties
- For cut flowers: clean, sharp snips and a clean vase
Step-by-Step
- Choose the right variety and location. Select a white cultivar suited to your climate and space. Check its expected mature size and flowering time; early, midseason, and late varieties extend the display. Give plants full sun in cool climates. In very hot areas, afternoon shade can help flowers last longer. Avoid low, waterlogged ground and locations beneath trees or shrubs that compete for moisture and light.
- Prepare the soil. Remove weeds and loosen the soil across the planting area rather than digging only a small hole. Mix in a modest amount of compost if the soil is poor, but do not make a rich, soft pocket that holds water. Peonies prefer fertile soil that drains freely. If water regularly stands after rain, choose a raised bed or another site.
- Plant at the correct depth. For a bare-root herbaceous peony, spread the roots in a broad hole and set the visible pink or red growth buds (eyes) about 1–2 inches below the finished soil surface in cold regions. In mild-winter areas, use the shallower end of that range. Planting too deep is a common cause of poor flowering. Set a container-grown herbaceous plant at the same soil level it had in its pot. For a grafted tree peony, keep the graft union several inches below soil level, following the nursery’s instructions. Plant intersectional peonies at the depth recommended for the specific plant. Refill, firm gently, and water thoroughly.
- Space plants and water in. Allow roughly 3–4 feet between mature herbaceous peonies for airflow, adjusting for the variety’s stated width. Keep the crown clear of neighboring plants. Water slowly to settle soil around the roots; do not leave the plant standing in a puddle. Add a light mulch layer to conserve moisture, keeping it away from the crown so it does not bury the buds.
- Water consistently while the plant establishes. During the first growing season, check the soil regularly and water deeply when the top few inches become dry. Established plants usually need extra water during prolonged dry spells, especially while buds form and flowers develop. Water at soil level, preferably in the morning, rather than wetting foliage and blossoms. Reduce watering in cool, rainy weather.
- Support stems before flowers open. Fit a peony ring or discreet stakes around the plant in early spring, before stems become tall and crowded. This keeps large double blooms from bending or snapping after rain. Avoid tying stems tightly, and make sure supports do not rub or constrict them as they grow.
- Feed lightly and keep the crown clear. If growth is healthy, heavy feeding is unnecessary. In spring, use a small amount of balanced, low-nitrogen fertilizer according to its label, applying it around the plant rather than onto the crown. Too much nitrogen can encourage leafy growth at the expense of flowers. Pull weeds by hand near the roots and refresh mulch without covering the buds.
- Remove spent flowers and care for foliage. Once a flower fades, snip off its flower head just above a healthy leaf to prevent seed production. Keep the green leaves in place through summer and fall; they replenish the roots for next year’s blooms. For herbaceous peonies, cut dead foliage to the ground in fall after it has yellowed or been killed by frost, and discard it rather than leaving diseased debris. Do not cut tree peonies down to the ground.
- Harvest cut blooms at the right stage. Cut flowers in the cool morning when buds feel soft, like a marshmallow, and show color but have not fully opened. Use clean snips and leave at least two or three sets of leaves on each stem so the plant can store energy. Place stems in clean water promptly, strip off leaves that would sit below the waterline, and keep the vase out of direct sun and away from heat. Change the water every one to two days and recut the stem ends.
Common Mistakes
The most frequent problem is planting herbaceous peony eyes too deep. If a healthy plant repeatedly produces foliage but no flowers, check its planting depth, sunlight, and nearby root competition. Other common errors include choosing a soggy site, crowding plants, applying excessive nitrogen, and removing leaves immediately after flowering. Peonies can take a few seasons to settle in, so avoid moving a healthy plant simply because it does not bloom in its first year.
Do not mistake ants on flower buds for a pest emergency. Ants visit the sweet secretion on buds and are not required for the flowers to open. Avoid spraying them unless there is a separate, identified pest problem.
Tips
- Plant or divide peonies in fall, giving roots time to establish before spring growth. Water divisions well after planting.
- Make sure the label identifies the plant type and mature size. The rules for herbaceous and tree peonies are not interchangeable.
- Pair cultivars with different flowering times if you want white blooms over a longer period.
- For a vase, remove lower leaves, use a clean container, and keep flowers cool overnight to extend their display.
- Peonies are generally hardy once established, but newly planted roots benefit from steady moisture and protection from weeds.
Troubleshooting
Leaves but no flowers: Check whether the eyes are buried too deeply, the plant gets enough sun, or it is receiving too much nitrogen. Newly planted peonies may need time to establish. Correct conditions gradually and wait through the next growing season.
Buds turn brown or fail to open: Late frost, drought, excessive shade, or a fungal disease can affect buds. Water during dry spells, improve airflow, and remove affected debris. Protect plants from forecast frost with a light garden cover, removing it once temperatures rise.
Stems flop over: Install a support ring early the next spring. If stems have already bent, gently support them without forcing a broken stem upright. Avoid overhead watering that leaves heavy blooms wet.
Yellowing leaves or rotting roots: Persistent wet soil may be the cause. Stop unnecessary watering, clear mulch from the crown, and improve drainage or move the plant during its dormant season if the site remains waterlogged. Remove diseased foliage and clean tools between plants.
Cut blooms wilt quickly: Recut the stems with clean snips, place them in fresh water, remove submerged leaves, and move the vase to a cool location away from sun, heaters, and ripening fruit.
Frequently Asked Questions
When should I plant white peonies?
Fall is usually best for bare-root plants and divisions. Container-grown plants can also be planted in spring, but need careful watering as they establish.
How much sun do white peonies need?
Most flower best with at least six hours of direct sun daily. Afternoon shade can be helpful in especially hot climates.
Why are my peonies not blooming?
Common causes include deep planting, insufficient sunlight, young plants, overcrowding, and too much nitrogen. Check these conditions before applying more fertilizer.
Do peonies need ants to bloom?
No. Ants are attracted to sugary secretions on buds, but the flowers open without them.
Can I cut peonies back after flowering?
Remove spent flower heads, but keep the leaves until fall. Cut herbaceous foliage down only after it yellows or dies back; do not cut tree peonies to the ground.
How long do cut white peonies last?
With a clean vase, fresh water, trimmed stems, and a cool location, they commonly last several days. Vase life varies by cultivar and how open the blooms are when cut.