Fernleaf Peony: Size, Zones, Bloom Time and Care

Early in the peony season, a low mound of feathery, thread-fine foliage opens single or double flowers in dark red, usually before the larger peonies have even set color. That is the fernleaf peony, Paeonia tenuifolia, a small herbaceous plant with a look all its own.

What Is the Fernleaf Peony?

Fernleaf peony is an herbaceous peony, so the stems and leaves die back to the ground each winter and the plant returns from the roots in spring. Its foliage is finely divided and fern-like, which sets it apart from the broad, glossy leaves of common garden peonies.

The flowers are single or double and are often only available in dark red or burgundy. It is typically the first peony to flower, and it is often the smallest peony type, rarely reaching more than 2 feet tall. That compact habit suits a front edge or a spot beside a path.

Where Does the Fernleaf Peony Grow Best?

Herbaceous peonies want a real winter rest and tolerate summer heat only so well, so the plant does better where cold is dependable and summers are not punishing.

• Upper Midwest: Iowa, Minnesota and Wisconsin give the deep winter chill that herbaceous peonies expect, and gardeners there grow this type with the other peonies.
• New England: Vermont, Maine and Massachusetts offer cold winters and cool springs, which suit an early bloomer with fine foliage.
• Pacific Northwest: The Willamette Valley and the Puget Sound area have mild summers, though the lack of hard cold in the mildest spots can mean fewer flowers.
• Gulf Coast: Mild winters and long, humid heat in Louisiana, Mississippi and coastal Texas leave an herbaceous peony short on rest and stressed in summer.

The state selector just below this section leads to the page for your state, where you can see what suits your own yard.

How to Care for the Fernleaf Peony Through the Year

Spring Growth

New shoots rise from the crown, and the finely cut leaves fill in quickly. This type can be difficult to establish, so a newly planted fernleaf peony needs patience. Keep the soil lightly moist while roots settle and resist the urge to dig it up if growth looks slow.

Bloom

Because it is typically the first peony to flower, the buds open ahead of the other peonies in your yard. A hard late frost can catch those early buds, so watch the forecast and be ready to cover the plant overnight. Single or double dark red flowers stand out against the lacy leaves.

Summer

After flowering, the foliage stays attractive as a fine green mound. Water during dry spells so the plant keeps its leaves and stores energy in the roots for next year. Its small habit means the plant seldom flops, so staking is rarely needed.

Fall Cutback

As an herbaceous peony, the foliage fades and browns once the weather cools. Cut the stems back to the ground and remove the clippings from the bed rather than leaving them to rot around the crown.

Winter

The plant rests underground, and that chill is part of how it prepares to bloom. Leave the bed alone and mark the spot so nobody digs or plants over a plant that slow to settle.

Fernleaf Peony Diseases and Weak Points

The plant’s main weak point is getting started. A young fernleaf peony can be slow to take hold, and a failed first year is more often about patience and placement than about disease.

Give it a sunny, well-drained spot and avoid crowding it, since airy foliage stays healthier when air can move through it.

Tall stems that flop are rarely a problem on a plant this small, so the cages and ties that larger peonies need can stay in the shed.

Is the Fernleaf Peony Right for Your Yard?

It suits gardeners who like fine texture, want an early burst of dark red, and have a small space to fill. It is a poorer match if you want large, fragrant, pastel blooms or need fast results in the first year.

• Choose it for a front border, a rock garden edge or a spot beside the walk, where a small plant gets noticed.
• Skip it if your winters are mild and your summers long, or if you want a big flower for cutting.
• Check the plant tag for the mature size before planting, then open the page for your state to see how it fits your climate.

Common Questions

Does the Fernleaf Peony Come in Colors Other than Red?

Flowers are often only available in dark red or burgundy, so that is the color most gardeners will find. Check the plant tag if you hope for something different.

Why Is My Fernleaf Peony Slow to Grow?

It can be difficult to establish, so a quiet first season is common. If the foliage is also yellowing and the soil stays soggy, drainage is the likelier problem and the plant needs a drier spot.

Will the Fernleaf Peony Flower Before Other Peonies?

Yes. It is typically the first peony to flower, so its blooms come ahead of the larger types planted beside it.