How to grow Buddleia in the UK
Buddleja davidii
Buddleia (Buddleja davidii) is a flower that grows well in UK gardens. Hard prune in spring or it gets leggy. Prune off dead flowers to stop self-seeding (it can become a weed). This guide covers when and how to sow Buddleia, 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 Buddleia
Sowing and harvest window through the year (UK):
Jan | Feb | Mar | Apr Plant | May | Jun | Jul | Aug | Sep | Oct | 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 Buddleia
No specific companion notes for this plant.
Grow Buddleia this year
Add Buddleia to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Buddleia FAQs
How much sun does Buddleia need?
Buddleia prefers full sun (6+ hrs direct).
Is Buddleia easy to grow?
Easy — good for beginners. Hard prune in spring or it gets leggy. Prune off dead flowers to stop self-seeding (it can become a weed).