Overview
Astilbe rivularis 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 rivularis 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 planting near ponds, streams and or in moist woodland gardens; suitable for shaded borders and naturalistic plantings.. It is native to Asia.
About
Astilbe rivularis is a clump-forming perennial that carries upright, feathery flower plumes above a mound of deeply divided, toothed leaves. Young foliage often shows a bronze tint before maturing. It favours reliably moist to boggy ground and will not tolerate drought. Flowering occurs from June to August.
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 rivularis belongs to the Saxifragaceae and is native to Asia; it forms clumps of divided foliage topped by erect, plume-like flowers. As a perennial adapted to damp, shaded sites it suits planting where soil remains consistently wet and where some shelter reduces exposure to drying winds. Position the plant in partial shade; only place it in full sun where the soil stays reliably wet. It prefers fertile loam or clay enriched with organic matter and a neutral to slightly acid pH. Aspect choices include north, east or west facing sites; a sheltered situation will help foliage remain in good condition. The species is rated H7 for the UK, meaning it is fully hardy outdoors. Use Astilbe rivularis at pond margins, alongside streams or in moist woodland borders and naturalistic plantings where soil stays moist to boggy. It tolerates heavier clay soils if organic matter is worked in to improve structure. Expect divided leaves that are often bronze-tinted when young, with upright, feathery flower plumes appearing from June to August.
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 rivularis 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 planting near ponds, streams, or in moist woodland gardens; suitable for shaded borders and naturalistic plantings.
- Native to
- Asia
Care notes
Pruning and caring for Astilbe rivularis
- 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 rivularis?
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 rivularis?
Astilbe rivularis prefers partial shade; full sun only where the soil stays reliably wet. It suits sheltered positions.
What soil does Astilbe rivularis need?
Astilbe rivularis 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 rivularis?
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 rivularis hardy in the UK?
Astilbe rivularis 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 rivularis?
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
- Astilbe 'Bumalda'False Goat's Beard
- Astilbe grandisgrand astilbe
- Astilbe taquetiiFalse Goat's Beard
- Astilbe × arendsii
- Astilbe × arendsii 'Amethyst'Amethyst Astilbe
- Astilbe × arendsii 'Bergkrystall'False Goat's Beard
- Astilbe × arendsii 'Betsy Cuperus'False Goat's Beard
- Astilbe × arendsii 'Bridal Veil'Bridal Veil Astilbe