Astilbe × arendsii 'Red Sentinel' (False Goat's Beard) — Clump-forming, upright plumes above a mound of foliage

Overview

Astilbe × arendsii 'Red Sentinel' is a clump-forming, upright plumes above a mound of foliage perennial in the genus Astilbe, part of the Saxifragaceae family, with deciduous; deeply divided and toothed, often bronze-tinted when young foliage. Astilbe × arendsii 'Red Sentinel' grows best in partial shade; full sun only where the soil stays reliably wet, and tolerates fertile loam or clay enriched with organic matter soils and neutral to slightly acid pH. Its UK hardiness is rated H7. Suggested uses include ideal for shaded borders, woodland gardens, and alongside ponds or streams where soil remains moist. also suitable for cut flowers and container planting in cool and moist conditions..

About

Astilbe × arendsii 'Red Sentinel' is a clump-forming perennial bearing upright plumes above a mound of deeply divided, toothed leaves. The foliage is deciduous and often bronze-tinted when young. It flowers from June to August and prefers partial shade with reliably moist soil.

About the genus

Astilbe is a genus of 18 species of rhizomatous flowering plants within the family Saxifragaceae, native to mountain ravines and woodlands in Asia and North America. Some species are known by the common names false goat's beard and false spirea.

Wikipedia contributors, "Astilbe", CC BY-SA 4.0 — Astilbe

In the garden

Astilbe × arendsii 'Red Sentinel' belongs to the Saxifragaceae and forms a neat clump topped by erect flowering plumes, set above deeply divided, toothed leaves that are often bronze-tinted in their early growth. The foliage is deciduous and the plant produces its flower heads from June to August. Best grown where the soil remains reliably moist to boggy, 'Red Sentinel' favours fertile loam or clay enriched with organic matter and a neutral to slightly acid pH. Position it in partial shade; it will only tolerate full sun where the ground stays consistently wet. Choose a north-, east- or west-facing spot with some shelter from strong exposure. Its UK hardiness rating of H7 denotes that it is fully hardy in typical UK conditions. Use this Astilbe in shaded borders, woodland-style plantings or beside ponds and streams where moisture is constant; it also suits container planting if compost is kept cool and damp. The upright plumes are suitable for cut flowers, allowing summer colour to be carried indoors as well as in the garden.

Growing conditions

Best soil and position for Astilbe

Sunlight: Partial shade; full sun only where the soil stays reliably wet
Soil type: Fertile loam or clay enriched with organic matter
Soil pH: Neutral to slightly acid
Soil moisture: Reliably moist to boggy; will not tolerate drought
Aspect: North, east or west facing
Exposure: Sheltered
UK hardiness: H7

Plant details

Astilbe × arendsii 'Red Sentinel' size, habit and characteristics

Plant type: Perennial
Habit: Clump-forming, upright plumes above a mound of foliage
Foliage: Deciduous; deeply divided and toothed, often bronze-tinted when young
Suggested uses: Ideal for shaded borders, woodland gardens, and alongside ponds or streams where soil remains moist. Also suitable for cut flowers and container planting in cool, moist conditions.

Care notes

Pruning and caring for Astilbe × arendsii 'Red Sentinel'

Cultivation: Moisture is everything - an astilbe that dries out scorches at the leaf margins and the plumes shrivel before they open. Plant in ground improved with plenty of organic matter, mulch generously each spring, and site out of hot afternoon sun unless the soil is genuinely wet. They are excellent in the damp shade where little else thrives.
Pruning: No pruning needed. Leave the spent plumes standing for winter structure and cut the whole clump down in late winter before new growth begins.
Propagation: Divide congested crowns in early spring; the woody rootstock may need a spade or a saw. Species can be raised from seed but cultivars will not come true.
Pest resistance: Largely trouble-free, though vine weevil grubs attack the roots of container plants.
Disease resistance: Healthy in suitable conditions. Powdery mildew appears on plants under drought stress, which is a symptom of the wrong site rather than of disease pressure.

Frequently asked questions

How do I grow Astilbe × arendsii 'Red Sentinel'?

Moisture is everything - an astilbe that dries out scorches at the leaf margins and the plumes shrivel before they open. Plant in ground improved with plenty of organic matter, mulch generously each spring, and site out of hot afternoon sun unless the soil is genuinely wet. They are excellent in the damp shade where little else thrives.

Where is the best place to plant Astilbe × arendsii 'Red Sentinel'?

Astilbe × arendsii 'Red Sentinel' prefers partial shade; full sun only where the soil stays reliably wet. It suits sheltered positions.

What soil does Astilbe × arendsii 'Red Sentinel' need?

Astilbe × arendsii 'Red Sentinel' grows best in fertile loam or clay enriched with organic matter soil. It prefers neutral to slightly acid soil. Aim for soil that stays reliably moist to boggy; will not tolerate drought.

How do I prune Astilbe × arendsii 'Red Sentinel'?

No pruning needed. Leave the spent plumes standing for winter structure and cut the whole clump down in late winter before new growth begins.

Is Astilbe × arendsii 'Red Sentinel' hardy in the UK?

Astilbe × arendsii 'Red Sentinel' has an RHS hardiness rating of H7, meaning it is fully hardy throughout the UK, tolerating temperatures below -20°C.

How do I propagate Astilbe × arendsii 'Red Sentinel'?

Divide congested crowns in early spring; the woody rootstock may need a spade or a saw. Species can be raised from seed but cultivars will not come true.

More in the Astilbe genus

Browse all Astilbe →