Exbury Azalea
Knap Hill-Exbury Hybrids (deciduous azalea) · Lionel de Rothschild, 1920s-1930s, UK
At‑a‑glance
- Group/Class: Knap Hill-Exbury Hybrids (deciduous azalea)
- Height × spread: 4-8 ft × 4-8 ft (1.2-2.4 m × 1.2-2.4 m) depending on cultivar
- Bloom window: mid to late spring
- Color & flower form: large trusses; yellow, orange, red, pink; mostly single
- Fragrance: 2 noticeable; varies by cultivar
- USDA hardiness: USDA zones 5 to 8
- Breeder / Year / Origin: Lionel de Rothschild, 1920s-1930s, UK
- Pet safety: avoid
How it differs
- Deciduous habit with reliable fall color.
- Often fragrant compared with many evergreen groups.
- Large flower trusses and bold colors.
- Less heat tolerant than some evergreen azaleas.
Strengths
- Cold hardiness suitable for Zones 5 to 8.
- Showy spring display and attractive fall foliage.
- Works as a specimen in woodland borders.
- Good pollinator interest during bloom.
Care in one minute
Plant in sun to light shade depending on summer heat; give afternoon shade in warm regions.
Soil: acidic, high in organic matter, and well drained; mulch to keep roots cool and moist.
Water during dry spells; shallow roots resent drought and standing water.
Fertilize lightly after bloom if needed; avoid overfeeding.
Prune only right after flowering; next year’s buds set by mid to late summer.
Watch‑outs
- Heat stress and reduced bloom in hot, droughty sites in the Deep South.
- Leaves may scorch in full afternoon sun without moisture.
- Requires acidic, well‑drained soils to avoid root problems.
Best uses (tags)
Provenance note
The Exbury strain was developed at Exbury Gardens, Hampshire, by Lionel de Rothschild using Knap Hill material and other parents, with many cultivars introduced in the 1920s and 1930s.
References
- Missouri Botanical Garden – ‘Gibraltar’ (Exbury) profile, zone guide
- NC State Extension – Rhododendron hybrids (Exbury notes)
- Arkansas Cooperative Extension – Hybrid azalea (heat tolerance note)
- ASPCA – Azalea (Rhododendron spp.) toxicity
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