Sweet woodruff

Sun

Partial to full shade; tolerates some morning sun where the soil stays moist.

Water

Keep evenly moist while establishing. Established plants tolerate brief dry spells, but prolonged drought can cause browning and summer dormancy.

Soil

Humus-rich, moist but well-drained soil. Tolerates acidic, neutral and alkaline conditions; avoid waterlogged ground.

Height

0.5-1 ft (0.15-0.3 m)

Spread

1-2 ft (0.3-0.6 m) initially, spreading farther by creeping rhizomes.

Flowers

Small white flowers in loose clusters in late spring to early summer.

Foliage

Narrow, bright to mid-green leaves arranged in star-like whorls around slender stems; usually dies back in winter.

Growth

Moderate to fast in moist shade; slower in dry soil.

Care needed

Low

• Water new plants regularly through their first growing season, keeping the soil moist rather than saturated.
• Water established patches during prolonged dry weather, especially beneath trees.
• Apply a thin layer of leaf mould or compost in spring; routine fertiliser is usually unnecessary.
• Lift unwanted rhizomes at the edge of the patch before they grow through neighbouring plants.
• Divide crowded patches in spring or autumn and water the divisions thoroughly.

Pruning. Remove dead stems in late winter or early spring before new shoots emerge. After flowering, trim ragged growth if needed, but avoid cutting drought-stressed plants until moisture returns.

Late winter

Clear away dead stems without damaging emerging shoots.

Spring

Plant or divide clumps and water them in well.

Spring

Add a thin layer of leaf mould or compost around the plants.

Early summer

After flowering, trim untidy growth and lift runners encroaching on nearby plants.

Summer

Check soil moisture during dry spells; water deeply if foliage begins to wilt.

Autumn

Divide or reduce established patches while the soil is moist.

• Carpet the ground beneath deciduous trees and shrubs, where spring flowers brighten the shade.
• Weave around established hostas and ferns to cover bare soil and contrast with their larger leaves.
• Edge shaded paths with a low, soft band of foliage, keeping it out of areas that receive foot traffic.
• Use in a shaded white garden with white-flowered hellebores and Solomon's seal.

Garden styles it suits: Woodland, Cottage garden, English country, White garden, Sensory garden and Low-maintenance.

Plant it with: Hostas, Hellebores, Solomon's seal, Japanese painted fern, Astilbes and Siberian bugloss.

Wildlife: The flowers attract small bees and flies. Dense foliage provides shelter for small invertebrates, but this Eurasian species is not a substitute for locally native woodland groundcovers.

• Brown or collapsing foliage in summer usually indicates dry soil or excessive sun; water deeply and provide more shade.
• Rhizomes can overrun small neighbouring plants; lift the advancing edges and avoid planting beside delicate woodland species.
• Slugs and snails may damage young shoots; hand-pick them and use iron phosphate bait according to the label if necessary.
• Root rot can occur in persistently wet soil; improve drainage or move healthy divisions to a better-drained site.

Not generally listed as toxic to cats, dogs or horses. The leaves and stems contain coumarin, especially noticeable by scent when dried; substantial or repeated consumption can be harmful to people, including possible liver damage. Small traditional flavouring quantities are different from eating the plant freely; do not treat it as an unrestricted edible herb.

Where it spreads. Can spread aggressively by rhizomes in moist, shaded gardens in the United Kingdom, southern Canada, and the northeastern and Pacific northwestern United States. It can escape into woodland; keep it away from natural areas and check local invasive-plant guidance before planting.

• Cleavers (Galium aparine)

  Cleavers is a scrambling annual with hooked hairs that cling to clothing and fur, plus bristly round fruits. Sweet woodruff forms a low perennial carpet and does not cling.

• Heath bedstraw (Galium saxatile)

  Heath bedstraw has much smaller leaves, usually six per whorl, and a finer, wirier habit. Sweet woodruff has broader leaves, usually six to eight per whorl, and larger, more conspicuous flower clusters.

Galium comes from the Greek word for milk, referring to the use of some bedstraw species in curdling milk, while odoratum means fragrant.

Propagation. Divide rooted clumps in spring or autumn; this is the simplest method. Seed germination can be slow and irregular and usually benefits from a period of moist cold, so sow fresh seed outdoors in autumn.

Accepted botanical name

Galium odoratum

In the US and Canada

Introduced in Canada and the lower 48 states.

Native range

Albania, Algeria, Altay, Austria, Baltic States, Belarus, Belgium, Bulgaria, Central European Rus, China North-Central, China South-Central and Corse.

Measured

Soil pH 5.5 to 6.5. Average height 12 cm.

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