Ornamental · Ranunculaceae
Japanese Anemone
Anemone × hybrida
Plant it once for late-summer flowers on tall, swaying stems, and it returns to grace the garden more fully each year.
Partial shade
Every 3–7 days
USDA 4–8
2–4 ft · 0.6–1.2 m
Overview
Japanese anemone gives the late garden its closing note, lifting soft pink and white flowers on tall, wiry stems just as the rest of the border settles toward autumn. A member of the buttercup family, it comes, despite the name, from the scrub and streamsides of central and southwestern China. Set at the back of a shaded bed or along a path where afternoon light catches it, the flowers hover above the leaves and answer every breeze, an easy motion that earned the older name windflower.
This is a perennial that shapes a planting slowly. A new plant keeps its first year quiet, then finds its stride and drifts on fibrous suckering roots into wide, weaving colonies. That reach turns a roomy shade border into a soft, informal sweep, so it suits a generous corner far better than a tidy pocket, and it pairs with a garden meant to be lived with rather than clipped.
It asks for little beyond part shade and steady moisture, which makes it an easy fit for a relaxed weekend routine. Give it fertile, humus-rich ground that never bakes dry, steady the tallest stems where the site catches wind, and cut it back after frost. In return it carries the garden, and the view from the window, from late summer into fall.
Care
The short version: part shade, fertile humus-rich soil kept evenly moist, and a little patience through the first year while the planting settles in.
Light
Japanese anemone sits happiest in part shade, catching morning sun and resting through the fiercest hours of the day. It will take full sun in cooler regions where the soil stays moist, and part sun suits it too, but a deeply shaded corner thins the display.
Water
Keep the soil consistently moist and never let it run dry, above all through the heat of summer. A drink every 3 to 7 days serves most beds, a little more in a dry spell, and a layer of mulch holds that moisture around the roots.
Soil
Give it fertile, humus-rich, well-drained loam worked through with organic matter. It leans toward a pH of 6.5 to 7.5, close to neutral, and a bed that sits soggy through winter is one of the few things that will undo it.
Humidity
Ordinary garden air is all it looks for, so there is no figure to chase. Air movement counts for more, since foliage left crowded and damp opens the door to the leaf diseases this plant can pick up.
Feeding
Feed it across the growing season with a balanced fertilizer, or simply top-dress the crown with compost come spring. A rich, well-fed bed keeps the flowers coming with little further effort.
Pruning
Trim the spent flower stems to keep the planting composed as the season turns. After frost has knocked it back in late fall, cut the foliage right to the ground to clear tired growth and the disease that would linger in it over winter.
Size & spacing
Grown plants reach 2 to 4 feet (60 to 122 cm) tall and open out 1 to 3 feet (30 to 91 cm) wide. Set each toward the roomier end of that range, both for airflow and because it keeps drifting outward as the years pass.
When to plant
Japanese anemone is a late performer that wants a full season to settle before it gives you anything. Set out container plants or divisions in spring once frost has passed, then look for the flowers from late summer into autumn, where they hold the scene 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 to a planting, and most of what surfaces is cosmetic or simply the plant biding its time. Reading the early signs on the leaves and stems lets you tend it before anything spreads through the bed. Match what you see below, then act while a light touch still settles it.
A restrained first year with little growth or bloom
A newly set plant keeps its first season quiet while it lays down a fibrous suckering root system below the border, so the understated debut is part of the plan rather than a fault. Let the ground go dry, though, and the pause only lengthens. Hold the soil evenly moist, tuck mulch over the crown, leave the planting undisturbed, and the display arrives in earnest across 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
Marked or dusted foliage in the border
Blemished or filmed leaves usually signal a fungal leaf disease such as leaf spot, downy mildew, powdery mildew, or rust, with foliar nematodes leaving a similar banded look. A crowded, humid corner of the planting is where it settles in. Lift away the marked leaves, ease the clump apart so air can move through the group, and direct water to the base rather than across the foliage.
Fix:
- Remove and discard affected leaves
- Improve air circulation by spacing or thinning plants
- Avoid overhead watering and water at the base
Chewed leaves and flowers in the planting
Most of this ragged feeding comes down to slugs, betrayed by the slime trails they leave across the bed, with caterpillars, flea beetles, and other beetles adding to it. Gather up what you can by hand and place a few slug barriers or traps among the plants. Clearing the litter where these pests wait out the day keeps their numbers in check.
Fix:
- Handpick slugs and caterpillars
- Use slug barriers or traps
- Remove plant debris where pests shelter
Tall stems leaning across the border
The blooms ride on tall, wiry stems, so wind, rain, or the lush growth of a rich, shaded position can tip them across their neighbors. A stake set beside the taller kinds ahead of flowering keeps the picture upright and composed. A part-shade spot with a little shelter from the wind spares the planting most of that leaning from the start.
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, so it belongs in a bed set apart from grazing animals and curious pets rather than a well-trafficked corner. Chewing the leaves or stems releases protoanemonin, a compound that burns the mouth and upsets the stomach, and the 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 cat that chews the leaves or stems releases protoanemonin, which burns the mouth and sets off drooling, vomiting, and diarrhea. Many turn listless and lose interest in food along with it.
Dogs Mild
A dog meets the same sore mouth and unsettled stomach, with drooling, vomiting, and loose stools following soon after a bite. The bitter, burning sap tends to see it off before much is eaten.
Horses Toxic
For a horse, the irritant sap blisters the lips and mouth and disturbs the gut, so the animal drools, turns from its feed, and risks colic and diarrhea. It has no place near grazing.
Rabbits Toxic
The protoanemonin that unsettles other animals makes the foliage an unsafe nibble for rabbits, which are best kept well clear of it. A mouthful leaves them drooling and off their food.
Livestock Toxic
Cattle, goats, and sheep can end up with blistered mouths and digestive upset from grazing it, though the acrid taste usually stops them short of eating much on their own.
Birds Toxic
The irritant compound leaves every part unsafe for birds, so the plant belongs out of reach of pet and backyard birds alike.
People Caution
No part of this plant is meant for the table, and chewing it irritates the mouth and stomach. The sap can redden bare skin as well, so gloves are the sensible choice 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
The Japanese anemones grown in gardens are mostly named hybrids, set apart chiefly by flower color and form. These are the ones worth choosing by name.
Honorine Jobert
An old French hybrid from 1858, it lifts single white flowers of 6 to 9 overlapping petaloid sepals around a yellow eye on tall, wiry stems.
September Charm
A late-season favorite whose silvery pink flowers deepen toward rose above a center of yellow stamens.
Pamina
A form of Anemone hupehensis var. japonica sought after for its deep rose, semi-double flowers.
How to propagate
Japanese anemone is grown from division rather than seed, an easy way to carry a favorite from one part of the garden to another.
DivisionEasy
Divide in spring as new growth emerges. · One to two growing seasons to reestablish vigor.
The graceful way to make more is to lift and split an established clump in spring as the new growth rises. Running as it does on fibrous suckering roots and rhizomes, the clumps and root pieces part and replant with ease, each division taking one to two seasons to come back into full vigor.
Myths
Japanese anemone is a true Japanese native.
In fact the plant hails from the scrub, grassy slopes, and streamsides of central and southwestern China. So many years of cultivation and naturalizing in Japan fixed the name to it, yet its origins are Chinese, not Japanese.
Japanese anemone fills in fast and blooms well its first year.
That opening year tends to be reserved, the plant tending its roots and flowering sparingly as it finds its place. A season or two on, it grows notably vigorous, broadening into generous colonies once it has settled.