The best time for when to plant peonies is fall, from September to early November in most of the US and UK, while the soil is still workable and a few weeks before the ground freezes. Bare-root peonies planted in autumn settle in over winter and are ready to grow in spring.
Peonies are long-lived perennials that can flower for decades, so a little care at planting time pays off for years. The two things that matter most are timing and depth. Here is how to get both right.
Quick Answer: Peony Planting Time at a Glance
- Best time: fall, about 6 weeks before the ground freezes.
- Second best: early spring, as soon as the soil can be worked.
- Depth: buds (eyes) about 1.5 to 2 inches (4 to 5 cm) below the surface.
- Light: at least 6 hours of direct sun.
- First blooms: usually in the second or third spring.
Why Fall Is the Best Time to Plant Peonies
Bare-root peonies are sold dormant in autumn. Planted then, the roots grow in cool soil while the top stays asleep, so the plant puts its energy underground. Spring planting works but the plant is often a year behind, and potted peonies from garden centers can go in at nearly any time if you keep them watered.
Herbaceous peonies also need a cold winter to set flower buds. They are generally hardy in USDA zones 3 to 8, so check yours on the USDA Plant Hardiness Zone Map. In hot zones 9 and above, flowering is poor, and low-chill varieties or tree peonies suit warmer gardens better.
When to Plant Peonies by Type and Region
| Type or region | Best planting time | Notes |
|---|---|---|
| Herbaceous, cold zones 3 to 5 | September to early October | Plant early so roots establish before hard freeze |
| Herbaceous, zones 6 to 7 | October to early November | Cool soil is ideal |
| Tree peonies | September to October | Graft union planted deeper, about 4 to 6 inches |
| Itoh (intersectional) | Fall or early spring | Plant like herbaceous types |
| UK | October to November | Container plants can go in spring |
How to Plant Peonies Step by Step
- Pick a sunny, open spot with good air circulation and well-drained soil. Avoid sites that stay wet.
- Dig a hole about 18 inches (45 cm) wide and deep, and mix compost into the soil.
- Soak bare roots in water for an hour or two before planting if they look dry.
- Set the root with the eyes (pink or red buds) facing up and no more than 1.5 to 2 inches below the soil surface.
- Backfill gently, firm the soil, and water well.
- Space plants 3 to 4 feet (about 1 to 1.2 m) apart. Add a light layer of mulch for the first winter, and remove it in spring.
Why Planting Depth Matters for Peony Blooms
Planting too deep is the top reason peonies produce leaves but no flowers. If the eyes are buried more than about 2 inches, the plant grows but struggles to bloom. In mild climates plant them closer to 1 inch deep. If a peony is not flowering and has been in the ground for years, lift it in fall and replant at the correct depth.
Looking for other fall planting jobs? Try our guides on when to plant garlic, when to plant tulip bulbs and the best deer repellents to protect new plantings.
Peony Planting Mistakes and How to Fix Them
- No blooms: usually too deep, too much shade, or the plant is simply young. Replant shallower or move to sun.
- Gray mold (botrytis): buds turn brown and rot. Cut back foliage in fall, discard it, and improve airflow.
- Floppy stems: support heavy blooms with a peony ring or cage in spring.
- Root rot: caused by wet soil. Amend heavy ground or plant on a mound.
- Ants on buds: harmless. They feed on nectar and do not damage the flower.
Caring for Peonies After Planting
Water new plants during their first year if rain is scarce, then peonies are quite drought tolerant. Feed lightly in spring with a balanced or low-nitrogen fertilizer, as too much nitrogen gives leaves instead of flowers. Cut herbaceous peonies back to the ground in fall after the foliage yellows. Do not cut back tree peonies, which have woody stems. Leave established clumps alone; they dislike being moved.
Conclusion
Fall is the sweet spot for planting peonies. Choose a sunny spot, keep the eyes close to the surface, and be patient for the first two or three years. Once settled, a peony will reward you with huge, fragrant blooms every late spring for decades.
FAQ
Can I plant peonies in spring?
Yes. Potted peonies can go in during spring, and bare roots can be planted as soon as the soil thaws. They may take an extra year to bloom.
How long do peonies take to bloom after planting?
Typically two to three years. A few flowers in the first spring are a bonus, but strong roots matter more.
How deep should I plant peony roots?
Plant herbaceous peony eyes 1.5 to 2 inches (4 to 5 cm) below the soil surface. Slightly shallower is better than deeper in mild areas.
Do peonies need full sun?
They do best with at least six hours of direct sun. In very hot regions, afternoon shade helps flowers last longer.
Can I grow peonies in pots?
You can, using a large, deep container with drainage, but they need winter protection in cold zones because roots are more exposed than in the ground.
