How to Plant Peonies for Big Blooms Every Year

Learning how to plant peonies comes down to three things: plant in early fall, set the pink buds (called eyes) no more than 1 to 2 inches below the soil surface, and give the plant at least six hours of direct sun a day. Get those right and a peony can bloom for decades; get the depth wrong and you may wait years for flowers that never come. Peonies are long-lived perennials, and Oregon State University Extension notes they can live for 50 years or more, so a little care on planting day pays off for a very long time.

This guide covers when to plant, how to choose roots and a spot, the step-by-step planting method, why depth matters so much, how to grow peonies in warm climates, first-year care and what to do when peonies refuse to bloom. The advice comes from university extension services in Iowa, Wisconsin, Oregon, Illinois and South Carolina, and where they differ slightly, we show both numbers.

Jump to: Short version | When to plant | Roots and site | Step by step | Planting depth | Warm climates | First-year care | Calendar | No blooms? | Safety | FAQ

How to Plant Peonies: The Short Version

If you only read one section, read this one. Everything else in the guide explains why these numbers matter.

When to Plant Peonies

Early fall is the best time. Clemson Extension says fall planting is best for both herbaceous and tree peonies, and Iowa State recommends September for dividing and planting peonies in Iowa. Planting in fall gives the roots weeks of cool, damp soil to settle in before winter, so the plant wakes up in spring already anchored.

If you buy a peony in a container, Iowa State advises transplanting it at about the same depth it was growing in the pot. If you buy bare roots, which look like a handful of thick, fleshy roots topped with small pink or reddish buds, handle them gently and get them in the ground as soon as you can.

Fall is also a busy gardening moment. While you are outside, lifting your tender tubers is the other big job of the season, and our guide on how to overwinter dahlias walks you through it. If you are adding spring bulbs to the same bed, our guide on how to plant flower bulbs covers depth and spacing for tulips, daffodils and more.

Choosing Peony Roots and a Planting Spot

What to look for in bare roots

Oregon State Extension says a good division should have three to five eyes. Eyes are the swollen pink or red buds at the top of the root, and each one will become a stem. Choose firm roots with several eyes, and avoid any that are soft, mushy or moldy.

Pick a sunny, open spot

Peonies need at least six hours of direct sunlight a day, according to Iowa State University Extension, which also advises keeping them away from trees and large shrubs that cast shade and compete for nutrients. Good air circulation helps prevent disease. In very hot climates, Oregon State notes that afternoon shade can help.

Check the drainage

Peonies need well-drained soil, because poor drainage can cause root rot. Iowa State says compost worked into the soil can help improve drainage, and Oregon State recommends deep, rich soil with generous amounts of organic matter. Avoid low spots where water pools after rain.

Leave room to grow

Peonies are bigger than they look in the pot. Iowa State says mature plants reach 3 to 5 feet wide, and Clemson gives a 3 to 4 foot spread. Oregon State suggests spacing plants 2 to 3 feet apart in masses, or 3 to 4 feet apart when used as specimens. Crowded peonies get less air and sun and are more prone to disease.

How to Plant Peonies, Step by Step

Step 1: Prepare the bed

Loosen the soil in a wide area, rather than just digging a small hole, and mix in compost or other organic matter. Peonies live a long time and resent being moved, so it is worth getting the soil right the first time.

Step 2: Set the roots with the eyes facing up

Place the root in the hole with the eyes pointing up, spreading any long roots out gently rather than bending them. Oregon State describes replanting with the eyes facing up and exactly one inch below the soil surface.

Step 3: Check the depth before you backfill

This is the step that decides whether your peony blooms. Lay a stick or trowel handle across the hole and measure from it down to the tops of the eyes. They should be about 1 to 2 inches below the final soil line. If they are deeper, lift the root and add soil underneath. For a container-grown plant, match the depth it grew at in the pot.

Step 4: Backfill and firm the soil

Fill the hole with soil, press down gently to remove air pockets, and make sure the eyes stay at the right depth as the soil settles.

Step 5: Water well

Water thoroughly after planting, and keep up with watering through the first year. Iowa State advises thorough watering during the first year to establish roots.

Step 6: Mark the spot

The plant dies back to the ground over winter, so push in a stake or label where it is, to avoid digging into it by accident next spring.

Why Planting Depth Matters So Much

More peonies fail from being planted too deep than from any other cause. Clemson Extension puts it bluntly: most failures to bloom are caused by deep planting. A buried peony still grows lush green leaves for years, which makes the problem easy to miss. The extension services give slightly different numbers, but all point to shallow planting.

A sensible rule for most gardens is 1 to 2 inches, with the shallower end in warmer climates, following Clemson. Never exceed 2 inches. Wisconsin Extension adds that planted too deep, peonies produce foliage but little or no flowers.

Growing Peonies in Warm Climates

Peonies are happiest in cold-winter regions. Illinois Extension lists their hardiness range as zones 3 to 8, and Clemson notes that peonies often do not perform well in the lower South (zones 8 and 9) because of insufficient winter chilling. If you live in a mild climate, choose early-blooming types. Clemson says single and Japanese bloom types do better than doubles in South Carolina, and it recommends cultivars such as ‘Coral Charm’, ‘Blaze’, ‘Flame’ and ‘Kansas’. Plant even more carefully for depth in warm areas, keeping the eyes no deeper than 1 inch.

First-Year Care and When Peonies Bloom

Be patient with the first flowers

Peonies take their time. Iowa State says plants may not bloom the first spring, with flower production increasing over the second to fourth years and reaching full production after that. Illinois Extension says they may take two to three years to establish and bloom. Flowers appear in May through June.

Feed lightly

Peonies do not need much fertilizer. Iowa State suggests one-fourth cup of 10-10-10 in early spring, cultivated lightly around the crown but kept 6 inches away to prevent burn. Wisconsin warns that too much nitrogen produces leaves at the expense of flowers.

Support heavy blooms

Double-flowered varieties are top-heavy. Iowa State recommends metal hoops or rings placed in early spring, before the stems get tall, so the growth comes up through the support.

Leave the leaves after bloom, then tidy in fall

After flowering, Wisconsin Extension advises deadheading the spent blooms and leaving the leaves in place, so the plant can store energy for next year. In fall, remove the foliage to reduce disease.

The ant myth

You will often hear that ants are needed to open peony buds. Clemson says it is a myth that ants are necessary for peonies to bloom. Ants are drawn to the sweet sap on the buds but play no role in flowering. Oregon State notes they do no direct harm, though they may carry fungal spores, so there is no need to treat for them.

Peony Planting and Care Calendar

Why Peonies Do Not Bloom

If your peony is healthy but flowerless, University of Wisconsin Extension lists the usual suspects.

Planted too deep

This is the top cause. Eyes buried more than 1 to 2 inches produce leaves but few or no flowers. In fall, you can lift the plant, reset it at the right depth and be patient while it recovers.

Not enough sun

Peonies need a minimum of six hours of sunlight a day to flower well. A spot that was sunny when you planted can become shady as nearby trees grow.

Too much nitrogen

Heavy feeding, especially with lawn fertilizer nearby, drives leafy growth at the expense of flowers.

Recently moved or still young

Newly transplanted peonies need several seasons to return to normal flowering, and young plants need time to establish. This is why patience is part of the plan.

Peony Safety for Pets

The ASPCA lists peonies as toxic to dogs, cats and horses, noting a compound called paeonol. Signs of exposure include vomiting, diarrhea and depression. If you suspect your pet has eaten any part of a peony, contact your veterinarian or the ASPCA Poison Control hotline right away. Keep bare roots out of reach before planting, and be aware that digging dogs may unearth newly planted roots.

Quick Checklist: How to Plant Peonies

1. Plant in early fall.
2. Choose roots with three to five firm eyes.
3. Pick a spot with at least six hours of sun and well-drained soil.
4. Space plants 2 to 4 feet apart.
5. Mix compost into a wide planting area.
6. Set the eyes facing up, 1 to 2 inches below the surface.
7. Water well and keep watering through the first year.
8. Be patient: blooms may take two to three years.

Frequently Asked Questions About Planting Peonies

How do you plant peonies?

Plant peonies in early fall in a sunny, well-drained spot. Loosen the soil, mix in compost, set the root with the eyes facing up and cover it so the eyes sit 1 to 2 inches below the soil surface. Water thoroughly, and keep watering through the first year.

How deep do you plant peonies?

Plant peonies so the eyes are 1 to 2 inches (2.5 to 5 cm) below the soil surface. Oregon State says exactly 1 inch, Clemson says no deeper than 1 inch, and Illinois Extension says no deeper than 2 inches. Deeper planting is the main reason peonies fail to bloom.

When is the best time to plant peonies?

Early fall. Clemson Extension says fall planting is best, and Iowa State recommends September in Iowa. The roots establish in cool soil over fall and wake up in spring.

Do ants help peonies bloom?

No, that is a myth. Ants like the sweet sap on the buds, but Clemson Extension says they are not needed for the flowers to open. You do not have to treat for them.

Can you grow peonies in zones 8 and 9?

It is harder. Herbaceous peonies are listed for zones 3 to 8, and in zones 8 and 9 they often struggle for lack of winter chill, according to Clemson. If you try, choose early-blooming single or Japanese types and keep the eyes no deeper than 1 inch.

How long do peonies take to bloom after planting?

Often two to three years. Iowa State says plants may not bloom the first spring and then bloom more each year over years two to four, reaching full production after that. Once established, a peony may never need dividing.

The Bottom Line

To plant peonies well, choose a sunny, open, well-drained spot, plant in early fall, and keep the eyes only 1 to 2 inches below the soil surface. Water through the first year, feed lightly, and give the plant two or three seasons to settle in. The reward is a long-lived plant that blooms in May and June, year after year, with very little fuss.

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