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.
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.
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).
When should I plant Buddleia in the UK?
In the UK, plant Buddleia in April. Planting in this window gives the roots time to establish before the plant is asked to grow away.
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).