Azalea
Rhododendron simsii
Azaleas are flowering shrubs in the genus Rhododendron, prized for masses of funnel-shaped spring blooms. They prefer acidic soil, dappled light, and consistent moisture.
- Light
- Bright indirect light to partial shade
- Water
- Keep evenly moist; never let dry out
- Difficulty
- Moderate
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Overview
Azaleas are a group of shrubby Rhododendron species and hybrids grown for their profuse, colorful spring flowers. They include evergreen types (often grown as florist gift plants and in mild gardens) and deciduous types prized for fall color.
They are woodland understory plants at heart, thriving in acidic, humus-rich soil and dappled light. With the right conditions they reward gardeners with a dazzling, almost smothering display of bloom.
How to identify it
Identified by clusters of funnel-shaped flowers on compact, twiggy shrubs.
- Flowers: Funnel-shaped, often in dense clusters, in pink, red, white, purple, orange, or bicolor
- Leaves: Small, oval, often slightly hairy; evergreen or deciduous depending on type
- Habit: Dense, twiggy, mounded shrubs, typically 2-6 ft tall
- Stamens: Usually five (azaleas) versus ten or more in many other rhododendrons
Care & growing
Azaleas need acidic soil, even moisture, and shelter from harsh sun.
- Light: Bright indirect light or dappled/partial shade; avoid hot afternoon sun
- Water: Keep soil consistently moist; they have shallow roots and dislike drying out
- Soil: Acidic, well-draining, rich in organic matter
- Temperature: Hardiness varies by type; many evergreen types are tender
- Feeding: Use an acid-loving (ericaceous) fertilizer after bloom
- Maintenance: Mulch to keep roots cool and moist; prune just after flowering
- Propagation: From semi-hardwood cuttings or layering
Habitat & origin
Azaleas are native mainly to Asia (especially China, Japan, and Korea) and parts of North America and Europe, growing as understory shrubs in acidic woodland soils.
They are widely cultivated in temperate gardens worldwide, in woodland and shade borders, foundation plantings, and as indoor florist plants in colder regions.
Frequently asked questions
What is the difference between an azalea and a rhododendron?
Azaleas are a subset of the genus Rhododendron; they tend to be smaller, with funnel-shaped flowers and typically five stamens per bloom.
Why are my azalea leaves yellowing?
Often this signals alkaline soil (iron chlorosis). Azaleas need acidic soil; treat with an ericaceous fertilizer or soil acidifier.
When should I prune azaleas?
Prune right after flowering, since they set next year's buds in summer.
How big do azaleas get?
Most form dense, mounded, twiggy shrubs about 2-6 feet tall and wide, though dwarf and larger types exist depending on the variety.
Azalea guides
In-depth guides for identifying, growing, and caring for Azalea.
Azalea identified by the community
Real specimens identified with Plant Identifier.
