Aruncus sylvester (dioicus)

Description

Aruncus dioicus – goat’s beard

Botanical name: Aruncus dioicus (syn. Aruncus sylvester)
Common names: Goat’s beard
Family: Rosaceae (rose family)
Plant type: Herbaceous perennial
Habit: Bold, upright, clump-forming
Pot size: 2–3 litre pot
Eventual size: Approx. 1.5–2m tall × 1.2m spread
Foliage: Large, ferny, divided, fresh green leaves; deciduous
Flowers: Large, feathery, astilbe-like plumes of tiny creamy-white flowers in early to midsummer (June–July)
Scent: Not notably scented
Aspect / light: Full sun to full shade (best in partial shade)
Soil: Moist, fertile, humus-rich; tolerates damp ground; any pH
Hardiness: RHS H7 (very hardy, below −20°C); USDA zones 3–7
Exposure: Sheltered or open
Native range: Native to Europe, Asia and North America
Toxicity / pet & child safety: Generally considered non-toxic to people and pets

Aruncus dioicus, goat’s beard, is a magnificent, architectural perennial with large ferny foliage and tall, feathery creamy-white flower plumes in early summer. Superb for bold impact in moist, partly shaded borders.

GardenAdvice notes

A magnificent, statuesque perennial, goat’s beard forms a bold clump of large, ferny, fresh green foliage, topped in early summer by tall, feathery, astilbe-like plumes of tiny creamy-white flowers. Like a giant astilbe, it makes a superb architectural specimen for moist, partly shaded borders, bog gardens and woodland edges, thriving in the damp, cool conditions where many bold perennials struggle.

Growing & planting

Plant in spring or autumn in moist, fertile, humus-rich soil in partial shade for the best results, though it tolerates full sun in reliably moist soil and even quite deep shade. It is excellent in damp ground and beside water. Give it room to develop its bold size. Space about 90cm apart. Keep moist.

Care & maintenance

Low-maintenance in moist soil. Keep the soil from drying out, as it dislikes drought. The flower plumes can be left for their attractive seed heads, or cut back after flowering. Cut down old growth in late autumn or spring. Established clumps are tough and long-lived; divide in spring if needed, though the woody crown can be hard to split.

Propagation

• Division: Lift and divide in spring — the tough, woody crown may need a spade or saw to split.
• Seed: Can be raised from seed, though named plants are best divided.

Pests & diseases

Generally trouble-free, tough and healthy, thriving in moist soil with few pests or diseases. Sawfly can occasionally affect the foliage.

Uses in the garden

Superb as a bold architectural specimen in moist and partly shaded borders, bog gardens, beside ponds and streams, and at woodland edges, where its ferny foliage and creamy plumes bring height and impact.

Wildlife value

The creamy flower plumes are attractive to bees, hoverflies and other pollinating insects, and the seed heads provide interest and some food for wildlife.

Toxicity & safety

Goat’s beard is generally regarded as non-toxic to people and pets.

GardenAdvice tip

Goat’s beard is a superb plant for a moist, shady spot where you want real drama — think of it as a giant astilbe, with big ferny foliage and tall creamy plumes reaching up to head height. It thrives in the damp, partly shaded conditions many bold perennials dislike, so it’s ideal beside a pond or in a woodland border; just keep it moist and give it room.

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