How to grow Azalea in the UK
Rhododendron (Azalea group)
Azalea (Rhododendron (Azalea group)) is a flower that grows well in UK gardens. Smaller, denser cousin of rhododendron. Deciduous types have stunning autumn colour too. This guide covers when and how to sow Azalea, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
When to sow & grow Azalea
Sowing and harvest window through the year (UK):
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct Plant | Nov Plant | 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 Azalea
No specific companion notes for this plant.
Add Azalea to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Azalea FAQs
How much sun does Azalea need?
Azalea prefers partial sun (3–6 hrs).
When should I plant Azalea in the UK?
In the UK, plant Azalea in October, November. Planting in this window gives the roots time to establish before the plant is asked to grow away.
Is Azalea easy to grow?
Moderate. Smaller, denser cousin of rhododendron. Deciduous types have stunning autumn colour too.