Japanese anemone

Sun

Partial shade, especially afternoon shade in hot regions. Full sun suits cooler climates if the soil stays moist; deep shade reduces flowering.

Water

Keep the soil evenly moist but not waterlogged. Water deeply during dry spells, particularly in the first growing season.

Soil

Humus-rich, moisture-retentive soil with good drainage. Tolerates clay if it does not remain waterlogged, and grows in slightly acidic to slightly alkaline soil.

Height

3-5 ft (0.9-1.5 m)

Spread

2-3 ft (0.6-0.9 m) initially; creeping roots can eventually form much wider colonies.

Flowers

Late summer to autumn, usually August-October in the Northern Hemisphere and February-April in the Southern Hemisphere. White or shades of pink, with yellow centres; flowers may be single, semi-double or double.

Foliage

Dark green, lobed or divided leaves with toothed edges, forming a leafy mound below the flower stems. Leaves die back after hard frost.

Growth

Slow to establish, then moderate to fast spreading where conditions suit it.

Care needed

Medium

• Plant in spring in colder regions, giving roots a full growing season before winter.
• Water deeply during dry weather rather than allowing the root zone to dry out repeatedly.
• Apply compost and a 2-3 in (5-8 cm) organic mulch in spring, keeping mulch clear of emerging shoots.
• Avoid heavy nitrogen feeding, which encourages leafy growth and floppy stems.
• Support tall plants early with discreet stakes or a grow-through support in exposed positions.
• Divide congested clumps in spring and remove unwanted rooted shoots before they establish.

Pruning. Cut dead stems to ground level in late autumn or late winter, before new growth appears. Remove spent flower stems earlier if you want a tidier border.

Late winter

Cut down remaining dead stems before new shoots emerge.

Spring

Plant or divide clumps; water divisions well and expect them to take time to settle.

Mid-spring

Apply compost and mulch, then remove shoots spreading into neighbouring plants.

Early summer

Install supports around tall clumps before flowering stems become difficult to handle.

Summer

Water during dry spells, especially where tree roots compete for moisture.

Late summer to autumn

Enjoy flowering and remove faded flower stems if a tidy appearance is important.

• Plant through the middle or back of a border for late-season flowers above lower foliage.
• Use along a bright woodland edge with ferns and hostas, away from dense tree-root competition.
• Combine with asters and ornamental grasses for a loose autumn border.
• Use white-flowered forms beside shaded paths or seating areas where pale flowers stand out.
• Plant in a broad, contained bed where its spreading habit can create a substantial colony.

Garden styles it suits: English country, Cottage garden, Woodland, Romantic rose garden, New perennial (prairie) and Autumn colour.

Plant it with: Hostas, Ferns, Japanese forest grass, Hardy geraniums, Asters and Bugbane.

Wildlife: Open flowers provide pollen for bees and other insects late in the season. Double-flowered forms generally offer less accessible pollen.

• Unwanted spreading: remove rooted shoots promptly. Dig out roots carefully when reducing a colony, as fragments left behind can regrow.
• Slugs and snails on emerging shoots: inspect young growth and use barriers, hand-picking or labelled iron-phosphate bait where needed.
• Powdery mildew: avoid overcrowding, maintain soil moisture and remove badly affected foliage.
• Wilting, scorched leaves or poor flowering in dry sites: water deeply, mulch and move plants to afternoon shade if summer heat is persistent.

Treat all parts, especially fresh leaves, stems and sap, as toxic to people, cats, dogs and horses if eaten. Chewing can cause mouth irritation, drooling, vomiting or diarrhoea; larger amounts may cause serious illness. Sap can irritate or blister skin. Wear gloves when cutting or dividing, and seek medical or veterinary advice after ingestion.

Where it spreads. Can spread aggressively by creeping roots in moist gardens in the United Kingdom, temperate parts of the United States and Canada, and cooler parts of southeastern Australia. This garden-spreading behaviour does not by itself mean it is officially listed as invasive.

• Chinese anemone (Anemone hupehensis)

  A closely related parent of the hybrid, also sold as Japanese anemone. Many forms have smaller, single pink flowers, but cultivated forms overlap so much that a reliable nursery label is often needed.

• Snowdrop anemone (Anemone sylvestris)

  Much shorter, usually 1-1.5 ft (0.3-0.45 m), with nodding white buds and mainly spring to early-summer flowers rather than tall autumn-flowering stems.

• Wood anemone (Anemone nemorosa)

  A low woodland plant, usually under 1 ft (0.3 m), that flowers in spring and normally becomes dormant in summer.

Anemone comes from the Greek word for wind, hybrida identifies its hybrid origin, and Japanese refers to its long association with cultivation in Japan.

Propagation. Divide established clumps in spring or lift rooted shoots from the edge of a colony. Root cuttings taken during dormancy are another option. Seedlings may differ from the parent, so propagate named cultivars vegetatively.

Accepted botanical name

Anemone hybrida

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.