When to plant Common Lilac?

Common lilac thrives in full sun or partial shade, though flowering is most abundant in a sunny position. It tolerates a wide range of soils—loam, chalky, and clay—but prefers neutral to slightly alkaline conditions with good drainage. Avoid waterlogged sites, as lilacs dislike sitting in wet soil. Plant bare-root lilacs in October, November, March, or April, when the ground is workable and not frozen. Container-grown specimens can go in at any time during these months, though autumn planting gives roots time to establish before spring growth. Dig a hole roughly twice the width of the root ball and deep enough so the top of the root ball sits level with the surrounding soil. Break up compacted soil at the base of the hole and incorporate a handful of garden compost or well-rotted manure to improve structure, especially in heavy clay. Space plants 250 cm apart to allow for their mature spread of 200–400 cm. If planting a hedge or screen, maintain this spacing to ensure good air circulation and reduce the risk of powdery mildew. Position the plant so the graft union (if present) is just above soil level. Backfill with the excavated soil, firming gently with your heel to eliminate air pockets. Water thoroughly after planting to settle the roots, then apply a 5–7 cm layer of organic mulch around the base, keeping it clear of the stems. Stake only if the site is very exposed or the plant is top-heavy; lilacs develop sturdy root systems quickly and rarely need long-term support.