Ornamental · Ranunculaceae
Japanese Anemone
Anemone × hybrida
Plant it just once for late-summer flowers on tall, swaying stems, and it comes back stronger for you every year.
Partial shade
Every 3–7 days
USDA 4–8
2–4 ft · 0.6–1.2 m
Overview
Japanese anemone saves its best for the tail of the season, unfurling soft pink and white flowers on tall, wiry stems right as the rest of the border begins to fade. It belongs to the buttercup family and, despite the common name, traces back to the scrub and streamsides of central and southwestern China. Its blooms hover well above the leaves and rock with every passing breeze, and that easy sway is how it earned the tender old name windflower.
This is a perennial that quietly rewards a patient gardener, so do not lose heart early on. A young plant spends its first year simply settling in and flowering little, then finds its feet and spreads on fibrous suckering roots into wide, weaving colonies. That eager spreading is a joy in a roomy shade bed, so give it space to wander and it will thank you.
Beyond part shade and steady moisture, it truly asks for very little. Settle it into fertile, humus-rich ground that never bakes bone dry, slip a stake beside the tallest stems if your spot catches the wind, and cut it back once frost arrives. Do that much and it will carry your garden warmly from late summer straight into fall.
Care
The short version: give it part shade, fertile humus-rich soil kept evenly moist, and a little patience through that first quiet year while the roots settle in, and you will do just fine.
Light
Japanese anemone is happiest in part shade, where it catches gentle morning sun and rests through the fierce heat of midday. It will take full sun in cooler regions as long as the soil stays moist, and it copes with part sun too, though deep shade will thin out the flowers.
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 suits most gardens, a little more in a dry spell, and a soft layer of mulch will hold that moisture kindly around the roots.
Soil
Give it fertile, humus-rich, well-drained loam with plenty of organic matter mixed in. It likes a pH of 6.5 to 7.5, close to neutral, and the one thing to guard against is soggy winter ground, which is about all that will truly do it in.
Humidity
Everyday garden air is all it wants, so there is no target number to chase. Good air movement counts for more, since crowded, damp leaves are what open the door to the leaf diseases this plant can pick up.
Feeding
Feed it through the growing season with a balanced fertilizer, or just spread a little compost over the crown come spring. Rich, well-fed soil keeps it blooming happily with almost no effort from you.
Pruning
Snip off spent flower stems to keep the plant neat and cheerful through the season. Once frost knocks it back in late fall, cut the foliage right down to the ground to clear away tired growth along with any disease that would linger 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. Give each one room toward the wider end of that range, both for good airflow and because it keeps creeping outward, a little more each year.
When to plant
Japanese anemone is a fall bloomer that likes a whole season to settle in first, so there is no rush. Set out container plants or divisions in spring once the frost has passed, then simply wait for the flowers to arrive from late summer into autumn, where they hold on cheerfully 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 gives you very little to worry about, and most of what turns up is only cosmetic or simply the plant taking its time. Read the early hints on the leaves and stems and you can step in gently before anything spreads. Match what you see below, then act while a small nudge still does the job.
A quiet first year with little growth or bloom
Take heart if your young plant seems to do nothing at first, because it is busy underground building a fibrous suckering root system before it puts on a show. Letting the ground dry out is the one thing that truly slows it down. Keep the soil gently moist, tuck some mulch over the crown, leave it be, and you will be rewarded with real vigor 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
Spots, blotches, or a pale powdery film on the leaves
Blemished or dusted leaves are almost always a fungal leaf disease like leaf spot, downy mildew, powdery mildew, or rust, and foliar nematodes can leave similar banding, but none of it needs to worry you. Plants packed together in damp air suffer the most. Simply pick off the marked leaves, open the clump so air can slip through, and water down at the base rather than over the leaves.
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 with ragged holes
Nearly all of this nibbling comes from slugs, and the silvery slime trails give them away, though caterpillars, flea beetles, and other beetles join in now and then. Pick off any you spot and set out a few slug barriers or traps to ease the pressure. Tidying away the leaf litter where they hide by day makes a real difference too.
Fix:
- Handpick slugs and caterpillars
- Use slug barriers or traps
- Remove plant debris where pests shelter
Tall flower stems that lean or flop over
Those wiry stems lift the blooms high, so wind, rain, or rich shady spots can tip them over, and that is nothing to fret about. Slip a stake beside the taller kinds before they bloom and they will stand tall for you. Choosing a part-shade spot with a little shelter from the wind spares you most of the leaning in the first place.
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 is not the one to grow within easy reach of grazing animals or curious pets. Chewing the leaves or stems releases protoanemonin, a compound that stings the mouth and upsets the stomach, and the sap can redden bare skin. Keep pets, livestock, and children from nibbling it, and simply pull on gloves before you divide or cut it back and all will be well.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
When a cat bites into the leaves or stems it releases protoanemonin, which stings the mouth and can bring on drooling, vomiting, and diarrhea. Some cats also grow listless and lose interest in eating, so watch a curious one closely.
Dogs Mild
A dog that chews the plant meets the same mouth and belly irritation, with drooling, vomiting, and loose stools not far behind. Happily, the bitter, burning sap usually turns them away before they swallow much.
Horses Toxic
The irritant sap can blister a horse's lips and mouth and unsettle its gut, leaving the animal drooling, off its feed, and prone to colic and diarrhea. Keep this one well away from grazing horses.
Rabbits Toxic
The same protoanemonin that bothers other animals makes this an unsafe nibble, so it is best to keep rabbits away from the foliage completely. A bite can leave them drooling and turning up their nose at food.
Livestock Toxic
Cattle, goats, and sheep may get sore, blistered mouths and an upset stomach if they graze it, though the sharp taste usually stops them from eating much on their own. Still, it is kindest to fence it off from grazing stock.
Birds Toxic
The irritant compound makes every part unsafe for birds, so it is wise to keep it out of reach of pet and backyard birds alike. There is no safe amount for them to peck at.
People Caution
No part of this plant is meant for eating, and a chew on it will irritate the mouth and stomach. The sap can also redden bare skin, so slip on gloves whenever you divide or cut it back and you will be fine.
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 you will meet in gardens are named hybrids, sorted mainly by their flower color and form. Here are the few worth getting to know by name.
Honorine Jobert
This treasured old French hybrid dates to 1858 and lifts single white flowers, each with 6 to 9 overlapping petaloid sepals around a warm yellow eye, on tall and wiry stems.
September Charm
A lovely late-season favorite whose silvery pink blooms deepen toward rose and settle around a middle of yellow stamens.
Pamina
A form of Anemone hupehensis var. japonica that gardeners adore for its rich, deep rose, semi-double flowers.
How to propagate
Japanese anemone is grown from division rather than seed, and that is the simplest, most forgiving way to make more of a plant you already love.
DivisionEasy
Divide in spring as new growth emerges. · One to two growing seasons to reestablish vigor.
The easy, forgiving way to make more is to split an established clump in spring as the new growth pushes up. Since the plant grows on fibrous suckering roots and rhizomes, the clumps and root pieces lift and go back in without fuss, and each division simply needs one to two seasons to find its full vigor again.
Myths
Japanese anemone is a true Japanese native.
In truth the plant hails from the scrub, grassy slopes, and streamsides of central and southwestern China. Grown and naturalized in Japan for so long that the name simply stuck, its real roots are Chinese, not Japanese.
Japanese anemone fills in fast and blooms well its first year.
That first year is usually a quiet one, with the plant settling its roots and offering few flowers while it finds its feet, and that is exactly what it should do. Give it a season or two and it turns wonderfully vigorous, widening into generous colonies once it feels at home.