Ornamental · Ranunculaceae
Japanese Anemone
Anemone × hybrida
Plant it once for late-summer flowers on tall, swaying stems, and it returns fuller every year.
Partial shade
Every 3–7 days
USDA 4–8
2–4 ft · 0.6–1.2 m
Overview
Japanese anemone saves its show for late in the season, when soft pink and white flowers open at the tips of tall, wiry stems that lift them clear above the leaves. Each bloom is a shallow cup of rounded petaloid sepals set around a small central eye, and the flowers hang high enough that the least breeze rocks them on their thin stalks, the motion that earned the older name windflower. Below them sits a mound of dark, lobed foliage in the buttercup family, a plant that traces back to the scrub and streamsides of central and southwestern China.
This is a perennial that fills out slowly at first. A new plant spends its first year knitting roots below the crown and opening few flowers, then turns vigorous and creeps outward on fibrous suckering roots into wide, weaving colonies. Over the years the mounded clump broadens into a low sweep of foliage studded with those raised, swaying blooms.
What it wants is plain: part shade and steady moisture. Set in fertile, humus-rich ground that never dries hard, its slender stems climb toward flowering, and a stake steadies the tallest where wind reaches them. After frost blackens the leaves, a cut to the ground clears the old growth. Given that, the pink and white flowers carry from late summer into fall.
Care
The short version: part shade, fertile humus-rich soil kept evenly moist, and patience through the first year while the roots settle in.
Light
Japanese anemone colors best in part shade, catching soft morning light and resting the leaves through the harsh midday hours. It will stand full sun in cooler regions where the soil stays moist, and part sun suits it too, but deep shade thins the flowers to a scatter.
Water
Keep the soil consistently moist so the roots never dry, above all through summer heat when the broad leaves wilt fast. A drink every 3 to 7 days meets most sites, more in a dry spell, and a mulch layer traps the damp around the crown.
Soil
Root it in fertile, humus-rich, well-drained loam dark with organic matter. It leans toward a pH of 6.5 to 7.5, close to neutral, and a bed that stays soggy through winter is one of the few things that rots it out.
Humidity
Plain garden air suits the leaves, so there is no figure to chase. Air moving through the clump counts for more, since foliage left crowded and damp is where the pale spots and powdery films of leaf disease take hold.
Feeding
A balanced fertilizer through the growing season keeps the leaves green and the flowers full, or a spring dressing of compost worked over the crown does the same. Rich soil holds the color and the bloom without much more.
Pruning
Snip the spent flower stems once the petals drop to keep the clump clean. After frost blackens the foliage in late fall, cut it right to the ground to strip away the tired leaves and the disease that would ride out winter on them.
Size & spacing
A grown clump rises 2 to 4 feet (60 to 122 cm) on its stems and spreads 1 to 3 feet (30 to 91 cm) across at the base. Set each toward the wider end of that range, both to let air pass between the leaves and because the roots keep creeping outward year on year.
When to plant
Japanese anemone opens its flowers in fall but needs a full season to settle in first. Container plants or divisions go into the ground in spring once frost has passed, and the raised pink and white blooms then follow from late summer into autumn, lasting until the first hard frost.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Not commonly grown from seed; cultivars are propagated by division rather than sowing.
- Plant: Plant container-grown plants or divisions in spring after last frost.
- Harvest: Late summer to fall, roughly August to October until first frost.
Hardiness
USDA hardiness zones: 4–8
Temperature: down to -34°C
Troubleshooting
Japanese anemone brings few real troubles, and most of what shows is only skin-deep on the leaves or a sign of the plant taking its time. The first marks appear on the leaf blades and stems, where a close look catches them before they spread. Match what you see below, then act while it still helps.
Little growth or bloom across the first season
In its first year the plant sends its energy down into a fibrous suckering root system, a web of thread-like roots and creeping stems, before it shows much leaf or flower above the soil. A dry spell during this stage stalls it further. Steady moisture, a blanket of mulch over the crown, and an undisturbed plant bring fuller leaf and bloom in the second and third seasons.
Fix:
- Keep soil consistently moist during the first growing season
- Mulch to conserve moisture and protect roots
- Be patient and avoid disturbing the developing crown
Pale spots, blotches, or a powdery film on leaves
Pale flecks, dark blotches, or a chalky white dusting across the green leaves point to a fungal leaf disease such as leaf spot, downy mildew, powdery mildew, or rust, and foliar nematodes leave narrow discolored bands of their own. Crowded, damp leaves suffer most. Stripped-off affected leaves, air moving freely through the clump, and water aimed at the base clear the foliage.
Fix:
- Remove and discard affected leaves
- Improve air circulation by spacing or thinning plants
- Avoid overhead watering and water at the base
Ragged holes torn in leaves and flowers
Torn, ragged holes across the leaf blades and petals are mostly the work of slugs, which leave glistening slime trails on stem and soil, with caterpillars, flea beetles, and other beetles adding their own bites. Handpicked pests, slug barriers or traps, and cleared litter where they hide by day thin the damage. The chewed edges heal over as fresh growth pushes up.
Fix:
- Handpick slugs and caterpillars
- Use slug barriers or traps
- Remove plant debris where pests shelter
Tall flower stems arching and bending over
The flowers ride at the tips of tall, wiry stems, thin and springy, so wind, rain, or the lush leaf of a rich, shaded spot bows them toward the ground. A stake set beside the taller kinds before bloom keeps those slender stems upright. A part-shade spot with a little wind shelter spares them most of the arching.
Fix:
- Stake or provide support for taller plants
- Site in part shade with protection from wind
Toxicity
Every part of this plant is toxic and irritant, from the lobed leaves to the wiry stems, so it is not one to grow within reach of grazing animals or curious pets. A bitten leaf or crushed stem weeps sap carrying protoanemonin, a compound that burns the mouth and upsets the stomach, and the same clear sap can redden bare skin. Keep pets, livestock, and children from nibbling it, and pull on gloves before you divide or cut it back.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
A bitten leaf or crushed stem weeps sap carrying protoanemonin, which burns a cat's mouth and sets off drooling, vomiting, and diarrhea. Many cats also grow dull and turn from their food.
Dogs Mild
A dog meets the same sting of mouth and stomach, with drooling, vomiting, and loose stools soon after the bite. The bitter, burning sap on the tongue usually turns it away before much is swallowed.
Horses Toxic
The irritant sap raises blisters on a horse's lips and mouth and churns the gut, leaving the animal drooling, off its feed, and prone to colic and diarrhea.
Rabbits Toxic
The same protoanemonin that troubles other animals makes the leaves an unsafe nibble for rabbits, so keep them clear of the foliage. A mouthful leaves them drooling and refusing food.
Livestock Toxic
Cattle, goats, and sheep can raise mouth blisters and an upset gut from grazing the plant, though its sharp, acrid taste keeps most from eating much unprompted.
Birds Toxic
The irritant compound runs through every part, unsafe for birds, so keep it out of reach of pet and backyard birds alike.
People Caution
No part of this plant is meant to be eaten, and chewing it stings the mouth and stomach. The clear sap can redden bare skin on contact, so wear gloves whenever you divide or cut it back.
Sap can irritate skin and cause contact dermatitis; wear gloves when handling, dividing, or cutting back plants.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Most Japanese anemones in gardens are named hybrids, told apart mainly by the color and form of their flowers. These are the ones worth knowing by name.
Honorine Jobert
An old French hybrid from 1858, it opens single white flowers built from 6 to 9 overlapping petaloid sepals ringing a yellow eye, held on tall, wiry stems.
September Charm
A late-season bloomer whose silvery pink petals deepen to rose and circle a boss of yellow stamens at the center.
Pamina
A form of Anemone hupehensis var. japonica carrying deep rose, semi-double flowers packed with extra petals.
How to propagate
Japanese anemone is grown from division rather than seed, the simplest way to lift and multiply a clump already in the ground.
DivisionEasy
Divide in spring as new growth emerges. · One to two growing seasons to reestablish vigor.
An established clump splits in spring as the pale new growth breaks the soil. The plant runs on fibrous suckering roots and rhizomes, a tangle of thread-fine roots and creeping stems, so the clumps and root pieces pull apart and settle back in with ease, each division taking one to two seasons to regain full vigor.
Myths
Japanese anemone is a true Japanese native.
The plant traces instead to the scrub, grassy slopes, and streamsides of central and southwestern China. Grown and naturalized in Japan for so long that the name held fast, its origins are Chinese, not Japanese.
Japanese anemone fills in fast and blooms well its first year.
A first-year plant keeps quiet, its roots knitting in while few flowers open as it finds its feet. A season or two on it turns vigorous, the clump broadening into weaving colonies once it settles.