How to grow Spirea in the UK
Spiraea japonica
Spirea (Spiraea japonica) is a flower that grows well in UK gardens. Indestructible. Hard prune annually keeps shape compact and bloom-heavy. This guide covers when and how to sow Spirea, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
Type
Flowers
Difficulty
Easy — good for beginners
Position
full sun (6+ hrs direct)
Sow
spring
Harvest
—
When to sow & grow Spirea
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 Spirea
No specific companion notes for this plant.
Grow Spirea this year
Add Spirea to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Spirea FAQs
How much sun does Spirea need?
Spirea prefers full sun (6+ hrs direct).
Is Spirea easy to grow?
Easy — good for beginners. Indestructible. Hard prune annually keeps shape compact and bloom-heavy.