Astilbe

Sun

Partial shade, preferably with morning sun and afternoon shade. Full sun is possible in cooler climates if the soil stays moist; deep shade reduces flowering.

Water

Keep the root zone consistently moist, especially during summer. Established plants tolerate brief dry spells better than many other astilbes, but prolonged drought causes brown leaves and poor flowering.

Soil

Humus-rich, moisture-retentive soil that drains freely; slightly acidic to neutral is ideal. Avoid dry, shallow soil and stagnant, waterlogged ground.

Height

2-3 ft (0.6-0.9 m)

Spread

1.5-2 ft (0.45-0.6 m), gradually wider through rhizomes

Flowers

Mid- to late summer; upright plumes of pink to lilac-purple flowers. Timing, colour and stature vary among cultivars.

Foliage

Deep green, divided leaves with toothed leaflets; new growth may have bronze tones. The foliage dies back for winter.

Growth

Moderate

Care needed

Medium

• Water deeply whenever the upper soil begins to dry; do not let the root zone dry out during flowering.
• Apply a 2 in (5 cm) layer of compost or leaf mould each spring, keeping it clear of emerging shoots.
• On poor soil, apply a balanced, slow-release fertiliser in spring at the label rate.
• Divide crowded clumps every three to four years, or when flowering weakens.
• Remove unwanted rhizomes at the edge of the clump if it spreads beyond its allotted space.

Pruning. Leave faded plumes for their shape or cut the flower stems to the base after flowering; deadheading does not normally produce another flush. Cut dead stems and leaves to ground level in late winter or early spring before new shoots emerge.

Late winter

Cut down remaining dead stems before new growth begins.

Spring

Plant or divide clumps, water thoroughly and mulch with compost or leaf mould.

Late spring

Check soil moisture as growth accelerates, particularly beneath trees.

Summer

Water during dry weather to protect leaves and developing flower plumes.

Late summer

Leave fading plumes for texture or remove them for a tidier appearance.

Early autumn

Divide established clumps where winters are mild enough for roots to settle before the ground freezes.

• Plant in groups through a partly shaded border for repeated upright plumes above a leafy ground layer.
• Combine with hostas and ferns for contrasting leaf shapes in moist woodland planting.
• Use beside a pond or stream on moist banks, above the permanently waterlogged margin.
• Pair with Japanese anemones in a sheltered border for a succession of summer and autumn flowers.

Garden styles it suits: Woodland, Cottage garden, Romantic rose garden, New perennial (prairie), Blues and silvers and Chinese scholar garden.

Plant it with: Hostas, Ferns, Japanese anemones, Siberian irises, Brunnera and Rodgersia.

Wildlife: The small flowers attract visiting bees and other insects. Deer and rabbits often leave the foliage alone, though browsing is still possible.

• Brown leaf edges or scorched foliage: check for dry soil and hot afternoon sun; water deeply, mulch and move to a cooler position if necessary.
• Poor flowering: increase light if the site is deeply shaded, maintain summer moisture and divide overcrowded clumps.
• Powdery mildew: improve airflow, avoid crowding and remove affected dead foliage at the end of the season.
• Vine weevil larvae, especially in pots: inspect roots if plants wilt despite moist compost; use a locally approved biological control at the recommended soil temperature.

Not known to be toxic to cats, dogs, horses or people; no plant part is generally recognised as poisonous. It is not a food plant, and eating substantial amounts may cause stomach upset.

• Goat's beard (Aruncus dioicus)

  Usually much taller and broader, with large, branching cream-white plumes in early summer rather than the narrower pink or lilac plumes typical of Chinese astilbe.

• Japanese astilbe (Astilbe japonica)

  Usually flowers earlier, with broader, more triangular plumes and often glossier leaves. Garden hybrids overlap considerably, so appearance alone may not establish identity.

• Meadowsweet (Filipendula ulmaria)

  Has loose, frothy clusters of fragrant cream flowers rather than upright feathery plumes; its leaves have larger terminal leaflets with conspicuously pale undersides.

The species name chinensis means 'from China', referring to part of its native range.

Propagation. Divide clumps in spring as shoots emerge, or in early autumn where conditions allow establishment before winter. Replant rooted sections promptly and keep moist. Seed can be used for the species, but seedlings vary and named cultivars do not come true.

Accepted botanical name

Astilbe rubra Astilbe chinensis is an older name for Astilbe rubra.

Native range

Assam, China South-Central, East Himalaya, Myanmar and Tibet.

Measured

Average height 80 cm.

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