Lilac

Lilac

RHS Genus Guide

‘Lilac-time’ is that much-anticipated, pre-summer moment when these pretty, and often scented, shrubs flower. Classic garden lilacs, derived from Syringa vulgaris, make substantial shrubs that may become tree-like with age. They are appreciated for their heady scent and large blooms and are useful at the back of sunny shrubberies. A range of other species contribute smaller-flowered shrubs that are often small in stature too – ideal for limited spaces, mixed plantings and containers.

Botanical name: Syringa

Common name: lilac

Appearance

Lilacs are all about flowers and scent. The small, single or double flowers in shades of purple, mauve, pink, cream and white form dense or loose clusters. The foliage is rarely a feature, though a few develop purple leaves in autumn, and the pinnate lilac, S. pinnatifolia, has ash-like leaves.

Preferences

Most lilacs like neutral to slightly alkaline soil that is moist but well-drained. They thrive in full sun but tolerate partial shade and can cope with a windy site.

Dislikes

Lilacs don't do well in extremely dry or very wet soil. Growth will be leggy and flowering poor in shade. Late frosts can damage new growth, turning the leaves brown or black.

Did you know?

If you have lilac in your garden, you could attract the striking pink, black and cream privet hawkmoth. Lilac is one of the food plants for its large, vivid green caterpillars.

RHS Growing Guide