Rose of Sharon

Sun

Full sun gives the best flowering; tolerates partial shade, with fewer flowers and a looser shape.

Water

Water regularly during establishment. Established shrubs tolerate short dry spells, but flower best with deep watering during prolonged dry weather.

Soil

Well-drained soil, from sandy loam to clay; tolerates acidic to alkaline conditions. Avoid persistently waterlogged ground.

Height

8-12 ft (2.4-3.7 m)

Spread

6-10 ft (1.8-3 m)

Flowers

Midsummer to early autumn; white, pink, red-purple, lavender or violet-blue flowers, often with a contrasting dark eye. Single, semi-double and double forms are available.

Foliage

Medium-green, coarsely toothed leaves, often with three shallow lobes. Leaves emerge late in spring and may turn yellow before falling.

Growth

Moderate; often faster in warm conditions with adequate moisture.

Care needed

Medium

• Water deeply through the first growing season, allowing the soil surface to dry slightly between waterings.
• Apply 2-3 in (5-8 cm) of organic mulch over the root area, keeping it clear of the stems.
• Feed lightly in spring only if growth is weak or the soil is poor; excess nitrogen encourages leaves rather than flowers.
• Pull unwanted seedlings while small, or remove seed capsules before they open.
• In colder parts of its range, choose a sunny position sheltered from drying winter winds.

Pruning. Prune in late winter or early spring before growth begins, removing dead, damaged and crossing branches. Flowers form on new growth; shorten selected stems to shape the shrub if needed, but avoid routine hard shearing.

Late winter

Remove dead or crossing branches and lightly shape the framework.

Spring

Plant container-grown shrubs once the soil is workable, then water well and mulch.

Late spring

Check apparently bare branches for live buds before removing them; this shrub leafs out late.

Summer

Water deeply during prolonged dry spells and check new shoots for aphids.

Early autumn

Remove developing seed capsules if you want to reduce self-sowing.

Late autumn

Remove unwanted seedlings and replenish mulch without burying the stem bases.

• Use at the back of a sunny mixed border for height and late-season flowers above lower perennials.
• Plant as an informal flowering hedge or summer screen, allowing enough room for its mature width.
• Train a young plant as a small standard beside a patio or entrance, keeping the crown clear of walkways.
• Combine with ornamental grasses and late-flowering perennials for a border that peaks in late summer.

Garden styles it suits: Traditional, Cottage garden, English country, Modern courtyard, Pollinator garden and Korean.

Plant it with: Catmint, Hardy geranium, Coneflower, Black-eyed Susan, Switchgrass and Stonecrop.

Wildlife: Single-flowered forms provide accessible pollen and nectar for bees and other insects; hummingbirds may visit in North America. Double flowers generally offer less accessible food. The branching framework can provide shelter for small birds.

• Aphids cluster on soft shoots and may leave sticky honeydew; wash them off with water and encourage ladybirds and other predators.
• Japanese beetles can skeletonise leaves in affected parts of North America; hand-pick them into soapy water and avoid placing beetle traps beside the shrub.
• Bud drop can follow drought, waterlogging or abrupt weather changes; keep soil moisture reasonably even and improve drainage where needed.
• Heavy self-sowing can crowd nearby planting; remove seed capsules, pull seedlings promptly or choose a cultivar documented as sterile.

Not known to be toxic to cats, dogs, horses or people; no part is generally recognised as poisonous. Eating large quantities of plant material can still cause stomach upset, so discourage pets and children from chewing it.

Where it spreads. Can self-seed aggressively in parts of the eastern United States, particularly the Mid-Atlantic and Southeast, and escape into disturbed ground and woodland edges. Fertility varies greatly by cultivar; check local invasive-plant guidance before planting.

• Tropical hibiscus (Hibiscus rosa-sinensis)

  Usually has glossy, largely unlobed evergreen leaves and often larger flowers with a conspicuous projecting staminal column. It is frost-tender, unlike Rose of Sharon.

• Swamp rose mallow (Hibiscus moscheutos)

  A herbaceous perennial that dies back to the ground in winter, with much larger flowers and broader leaves; Rose of Sharon retains woody branches.

• Rose of Sharon (Hypericum calycinum)

  This unrelated plant shares the common name, especially in the UK. It is a low, spreading groundcover with yellow, many-stamened flowers and small, unlobed leaves.

The botanical epithet syriacus means 'Syrian', reflecting an early mistaken association with Syria rather than the plant's East Asian origin.

Propagation. Take softwood cuttings in late spring or early summer, or hardwood cuttings after leaf fall. Seed is easy to raise, but seedlings may differ from the parent; propagate named cultivars vegetatively.

Accepted botanical name

Hibiscus syriacus

In the US and Canada

Introduced in the lower 48 states.

Native range

China South-Central, China Southeast and Taiwan.

Measured

Average height 213 cm.

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