Growing Peonies in Pots: Which Ones, Soil and Winter Care

A peony in a pot can stay on the patio season after season, which makes it easy to forget that its roots are more exposed to cold than roots in the ground. Herbaceous peonies can live in containers, and the soil, the pot size and the winter spot decide whether they flower.

Can You Grow Peonies in Pots?

Yes, herbaceous peonies can grow in containers, but their winter needs depend on the local climate. The type of peony and your local winter set the details. A potted peony usually carries fewer shoots and flowers than one planted in the ground, so expect a smaller show.

Winter matters more than most people expect. In research on container-grown peonies, fluctuating temperatures built up more chilling than a constant low temperature. In the container research, fluctuating temperatures provided more chilling accumulation than a constant low temperature.

Climate changes the plan. Where winters are mild, finding enough cold is the hurdle. Where winters are harsh, as in Alaska, roots in a container are more exposed to cold than roots in the ground.

How to Plant a Peony in a Container

Planting in a pot follows a short order, and each step protects the crown and the roots for the years ahead.

1. Pick the pot by crown size, so that a small crown is not lost in a huge volume of wet mix. In Virginia, a 1-gallon pot suits smaller crowns.
2. In Virginia, move up to a 2- or 3-gallon pot for larger crowns, so that the roots of a crown with 6 to 10 eyes have room to spread.
3. Fill the pot with a light, peat-based mix, so that water drains freely and the roots never sit in a soggy mass. In Virginia, trials found a nursery mix of 60% hydro fiber and 40% peat works well.
4. Blend in composted pine bark if your mix is plain peat, so that it holds air as it ages. In Virginia, a peat-based mix amended with bark at 1:1 by volume did well.
5. Set the crown so that it sits under 2 inches of mix, as Virginia growers advise, which keeps the buds protected without burying them too far.
6. Water the pot in after planting so that the mix settles around the roots and no air pockets remain.

Choose a pot with drainage holes, and set it where it gets plenty of sun. In Alaska, plastic grow bags have been suggested in place of rigid pots, since they may cost less and take up less room.

Which Peony Types Suit a Pot

Herbaceous peonies are the type container research covers, and the biggest difference between plants is the size of the crown you start with. A bigger crown wants a bigger pot, though not a much faster plant.

Cultivars such as Sarah Bernhardt and Katherine Fonteyn have been studied in containers, mainly for how they gather winter chill.

For you, the practical lesson is to match the pot to the crown and not to chase size. In the Virginia work on herbaceous peonies, container-grown plants had fewer shoots and flowers than field-grown plants, so pots are better suited to a small display than a cutting garden. For tree and Itoh peonies, check the nursery tag for pot and winter advice.

Mistakes to Avoid with Potted Peonies

Planting the Crown Too Deep

It feels safer to bury the buds well, yet a crown planted far below the surface sends up leaves and few flowers. Aim for 2 inches of mix over the crown, a depth tested in Virginia.

Choosing an Oversized Pot

In the Virginia work, there was very little difference in finish time between container sizes. A large volume of wet mix around a small crown just holds water longer. Fit the pot to the crown, and step up only when the crown has grown.

Sheltering from Every Temperature Swing

Tucking the pot into a steady, always-cold corner seems protective, yet fluctuating temperatures built up more chilling than a constant low in container plants. Fluctuating temperatures increased chilling accumulation in the container research, but that result alone does not show where a home pot should overwinter. In Alaska, local farmers’ potato storage sheds have been considered for peony storage, so ask nearby growers whether that approach suits your pot.

When to Give Potted Peonies Winter Care

The cue is the foliage. Once the leaves yellow and collapse in autumn, the plant is going dormant and the pot needs its winter position. Cut the dead stems back, then use local guidance to choose a winter position that protects the mix from waterlogging and the roots from damaging cold.

• Your state page lists the months for cutting back and moving pots where you live, so open it when the leaves start to fade.

Common Questions

Can You Use a Grow Bag Instead of a Pot?

In Alaska, plastic grow bags have been suggested in place of pots, because they may be cheaper and need less room.

Can a Potted Peony Spend Winter in a Shed?

In Alaska, growers have looked at borrowing local farmers’ potato storage sheds for peony storage. For a home pot, ask nearby growers whether an unheated shed offers suitable winter conditions in your climate.

What If a Potted Peony Does Not Survive Winter?

In Alaska, one gardener replaced the lost plants with more economical varieties from local nurseries, already growing in pots. Starting again with a nursery plant is a fair way to try a new spot, and the crown size will guide you to the right pot.

Sources : peonysociety.org | sarahraven.com | thepeonyfields.com