Common Lilac

How to grow Common Lilac

Written by the GardenDecoded editorial team · Last reviewed 21 July 2026 · Written for UK gardens · How we research our guidance

Planting

Plant in autumn or early spring in an open, sunny position. Lilac flowers poorly in shade, so give it room away from the shadow of buildings and larger trees. On acid soils work in garden lime or well-rotted manure before planting.

Pruning

Deadhead as soon as the flowers fade, cutting just above the pair of buds below the spent truss. Otherwise prune only lightly, since flower buds form on the previous year's wood. Old, congested plants can be renovated by taking out a third of the oldest stems at the base over three successive winters.

Propagation

Softwood cuttings in early summer, or by removing rooted suckers in autumn from plants growing on their own roots. Named cultivars are usually grafted, and suckers from those come from the rootstock rather than the variety.

Pests and diseases

Lilac blight (bacterial) can blacken shoots in wet springs; cut affected growth back into clean wood. Powdery mildew often appears on the leaves late in the season but does little real harm.

Value to wildlife

The scented flowers are worked by bees and by butterflies in late spring, a useful bridge between spring blossom and summer nectar.

Notes

Lilac suckers freely and can spread further than expected in a small garden. It also has a short, concentrated flowering season, so it earns its place best at the back of a border where the plain summer foliage is screened.

Some structured details on this page (such as tolerances, pH and hardiness) come from USDA PLANTS Database (public domain). The written guidance is GardenDecoded's own, researched as described in our editorial policy.

Other names for this plant

These names have all been used for Syringa vulgaris but are no longer the accepted name. You may still meet them on old labels, in books, or in nursery catalogues.

Others in Syringa