Also known as Cultivated Rhododendron · Rhododendron
Safety note: This plant may be toxic to humans and pets. See toxicity details.
Flame Azalea (Rhododendron calendulaceum) is a deciduous shrub known for its vibrant, fiery orange to red flowers, native to eastern North America.
At-a-glance light, water, soil, and growing conditions from plant data
Partial Shade
50% intensity
Thrives in dappled shade or morning sun with afternoon shade.
Consistent Moisture
75% intensity
Prefers moist soil; avoid drying out or waterlogging.
Acidic, well-drained, humus-rich
50% intensity
Cold Hardy
50% intensity
Tolerates cold winters; requires protection from extreme heat and harsh winds.
Acid-Loving
50% intensity
Feed with specialized fertilizer in spring; avoid late-season feeding.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | Yes 4/5 intensity |
| Toxic for pets | Yes 4/5 intensity |
| Edible | No |
Mildly toxic, contains grayanotoxins
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Keep the soil consistently moist but not waterlogged, especially during the growing season. Water deeply when the top 2-3 cm of soil feels dry. Avoid overhead watering which can promote fungal diseases.
Reduce watering in fall and winter when the plant is dormant.
Prune immediately after flowering to shape the plant and remove spent blooms. This prevents seed production and encourages bushier growth. Remove any dead, damaged, or crossing branches at any time.
Avoid heavy pruning in late summer or fall.
Easily propagated from softwood cuttings taken in late spring or early summer. Dip cuttings in rooting hormone and plant in a well-draining, moist medium. Maintain high humidity and moderate temperatures.
Seed propagation is also possible but more challenging.
Repot young plants every 2-3 years in early spring before new growth begins. Use a well-draining, acidic potting mix. Choose a pot slightly larger than the current one. Ensure adequate drainage holes.
Avoid disturbing the root ball excessively.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Flame Azalea (Rhododendron calendulaceum)
Where Flame Azalea (Rhododendron calendulaceum) is found
Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Ericales |
| Family | Ericaceae |
| Genus | Rhododendron |
| Species | Rhododendron calendulaceum |
Similar in genus Rhododendron
Answers based on plant encyclopedia data
