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Plant Profiles / Azalea
Photos: Wikimedia Commons
Azalea
Rhododendron (azalea groups) · Azalea
Shrubs that are smothered in vibrant pink, red, white, purple or orange flowers in spring. Azaleas love dappled shade, acidic soil and pots.
Part shadeLight
2–3 times a weekWater
ModerateCare level
Care at a glance
Light
Part shade
ShadeFull sun
Morning sun or dappled light. Afternoon sun scorches leaves and flowers.
Water
2–3 times a week
DryWet
Keep soil evenly moist; shallow roots dry out quickly. Mulch well.
Humidity
Average to high
LowHigh
Prefers humidity and shelter from hot winds.
Temperature
-15–30°C (5–86°F)
CoolWarm
Hardiness varies by type. Protect from extreme heat.
Growth
Slow, shrub
SlowFast
Grows 0.5–2 m depending on variety.
Soil
Acidic, well-drained
LeanRich
Use an azalea & camellia potting mix (pH 4.5–6).
Fertiliser
After flowering
RarelyOften
Feed with an azalea fertiliser after flowering.
Pet safety
Toxic
SafeToxic
Contains grayanotoxins. Highly toxic to cats, dogs and horses.
About this plant
Azaleas are part of the Rhododendron genus and come in evergreen and deciduous groups. They have shallow, fine roots, so they grow well in pots and need consistent moisture. Some modern varieties rebloom in autumn.
Best spots
Shaded balconies, courtyards, under trees and pots by doorways out of afternoon sun.
Plant facts
| Botanical name | Rhododendron (azalea groups) |
| Family | Ericaceae |
| Origin | Asia, Europe, North America |
| Plant type | Evergreen or deciduous shrub |
| Mature size | 0.5–2 m |
| Growth rate | Slow |
| Foliage | Small, glossy leaves |
| Flowers | Funnel-shaped blooms in many colours |
| Toxicity | Highly toxic to pets |
| Propagation | Semi-hardwood cuttings |
Seasonal care calendar
J
F
M
A
M
J
J
A
S
O
N
D
Flowering
Prune
Fertilise
Water more
FloweringPruneFertiliseWater more
Based on Southern Hemisphere seasons.
Troubleshooting
| Yellow leaves with green veins | Soil not acidic enough. Use acid fertiliser and iron chelates. |
| Brown, mushy flowers | Petal blight in wet weather. Remove affected flowers. |
| Silvery, mottled leaves | Lace bugs. Spray horticultural oil under leaves. |
| Wilting | Dry soil or root rot. Check moisture. |
| No flowers | Pruned too late or too much shade. |
Common questions
When should I prune azaleas?
Right after flowering, so next year's buds can form.
Can they grow in pots?
Yes, they're ideal in pots with azalea mix.
Why are the leaves yellow?
Usually soil that isn't acidic enough.
Are they safe for pets?
No, azaleas are highly toxic to pets.
