Peony Planting Guide

Few garden plants can deliver a show to rival that of well-grown peonies. Large bushes, lush flowers, fabulous fragrance and a lifetime of garden glory. Outstanding! Grown for centuries, these beauties are remarkably undemanding. Well sited, planted at the correct depth (they aren’t flexible on this) and given a bit of winter cold, these gorgeous perennials deliver their bounty spring after spring. Isn’t it time you had peonies to look forward to every May?

Peony Planting Information

Choosing a Site for Peonies

Select a planting site with full sun to ¾ day sun. While peony plants will often grow with less light, they don’t flower well without good sun. In fact, one of the primary reasons peonies fail to bloom profusely is because of insufficient sunlight. Given that peonies are such long lived plants, it’s worth a little effort to scout a site that’s sunny now and can be expected to stay that way for years; i.e. avoid planting where shade from nearby trees is likely to increase significantly. Also, allow 3-4 feet for each plant. This spacing ensures that when the peony is mature (4+ years old) it will enjoy the good air circulation that promotes healthy growth.

Soil Prep for Planting Peonies

Peonies are happy with average soil. Very rich soil can produce lots of foliage at the expense of flowers so avoid over fertilization. As with most plants, good drainage is required to prevent root rot.

When to Plant Peony Roots

Peonies can be planted successfully in the fall or in the spring. Plant upon receipt. Fall planted peonies have the advantage of being able to grow a nice set of feeder roots before having to support the stems, leaves, buds and flowers of an actively growing plants. 

How to Plant Peony Roots

Dig a hole large enough to accommodate the roots and add a handful or two of compost to the soil you removed. Add a little loose, amended soil back in the hole making a mound to rest the root on. Fan out the roots where possible; they can be stiff so take care not to break off.

Position the root in the planting hole so that the little growing points on the root crown are: 1.5 – 2” below the soil surface for cold climate gardens and 1” below the soil surface for warm region gardens. This may seem fussy but does matter for good flower production. Pat the soil to remove air pockets and water to settle the soil around the root. Check to make sure the root hasn’t sunk as the soil settled.

During the Spring Growing Season

Peonies need an average amount of water for good growth, typically about 1” of water a week from rain, irrigation or a combination of the two.

At Season’s End

Peony foliage typically holds its attractive looks through the fall and some varieties even have leaves that turn a lovely deep red, a nice bonus. When the foliage succumbs to frost or browns on its own, trim back to 2” above the soil line. Discard the trimmings; don’t compost.

The first fall, add 3-4” of loose mulch; pine needles, bark nuggets or straw. This provides insulation to limit the freezing and thawing of the soil as air temperatures fluctuate, and reduces the changes of frost heave. In spring, pull the mulch back away from the peony sprouts as soon as they appear. Look for new shoots that are pink or red – peony sprouts are colorful!

Insider Tips

  1. If you garden in a cold region, any of the peonies here are well suited to your climate. If you garden in zone 8, where winters are mild and spring temperatures can heat up fast, look for peony varieties noted as being good choices for warm regions.
  2. To reduce the need for staking, consider Japanese peonies. These varieties have elegant flowers with forms that are less likely to catch and hold springs rains, and bend stems. Japanese peonies are wonderful for cutting and many are fragrant. (We love these and believe they deserve to be grown more widely.)
  3. Give some thought to peony placement. Peonies don’t appreciate being moved and take a season or two to settle in after being transplanted. If you can avoid moving your peonies you won’t have to wait for the plants to re-establish.
  4. When your peonies have finished blooming it’s a good idea to trim off spent blooms, leaving as much foliage as possible. This makes the plant more attractive and reduces plant energies dedicated to seed production. Discard the foliage, rather than composting it, as botrytis fungal spores can be present on peony leaves.
  5. Ants sometimes are active on peony buds. The insects are drawn by the sweet sap and, contrary to popular folklore, don’t play a role in bud development.
  6. Peonies planted in the fall have the benefit of being able to establish feeder roots before having to support top growth. While peonies are tough plants that generally do fine planted in the spring, if you have the option, fall planting is preferable.
Shop Peonies
Shop Peonies

Success Snapshot

Light: Full sun to ¾ day sun

Soil: Average, well drained

Depth: Cover growing points with 1-2" of soil

Water: Average moisture

Uses: Beds, borders and sunny garden naturalized meadows

Tip: Planting depth is key for good flowering; see details at left

GUIDE: Peony Planting Guide

They Start Out looking Like This: