How to grow Lilac in the UK
Syringa vulgaris
Lilac (Syringa vulgaris) is a flower that grows well in UK gardens. Iconic spring scent. Slow to flower in early years. 'Sensation' is white-edged purple. This guide covers when and how to sow Lilac, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
When to sow & grow Lilac
Sowing and harvest window through the year (UK):
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct Plant | Nov | Dec |
Soil, position & care
- Soil
- Most well-drained soils with added organic matter
- Soil pH
- 6.0–7.5
- Position
- Sun or part shade depending on species
- Sowing depth
- Plant so the rootball top sits level with the soil
- Spacing
- Allow for mature spread
- Sowing
- Plant from containers spring or autumn; water in well
- Growing
- Water through the first two summers; mulch annually
- Harvest & upkeep
- Prune to shape after flowering; remove dead/crossing wood
- Watch for
- Generally tough; watch aphids and powdery mildew
Companion planting for Lilac
No specific companion notes for this plant.
Add Lilac to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Lilac FAQs
How much sun does Lilac need?
Lilac prefers full sun (6+ hrs direct).
When should I plant Lilac in the UK?
In the UK, plant Lilac in October. Planting in this window gives the roots time to establish before the plant is asked to grow away.
Is Lilac easy to grow?
Moderate. Iconic spring scent. Slow to flower in early years. 'Sensation' is white-edged purple.