shrubN. America Native

Flame Azalea

Rhododendron calendulaceum

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Shrub

Height

72 inches

Width

96 inches

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8

Water

Consistent moisture required

Humidity

Prefers humid environments

Lifespan

Decades

Native To

Appalachian Mountains

Toxicity

All parts are highly toxic if ingested

The Story

Plant Bio

Rhododendron calendulaceum, commonly known as the Flame Azalea, produces striking orange to yellow flowers. This species is known for its vibrant blooms and ability to thrive in acidic soils.

Bloom Period:

EarlyLate

Uses & Benefits:

Provides vibrant, early spring color with its striking orange flowers, ideal for shaded gardens.

Prefers acidic, well-drained soil, making it suitable for specific garden conditions.

Attracts hummingbirds and beneficial insects, supporting local biodiversity.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

Shipping costs Year-round shipping Free shipping

Planting

How to Grow

Select a well-draining acidic soil with organic matter.
Tuck seeds or cuttings in early spring for best germination.
Mist cuttings regularly to maintain humidity.
Plant in partial shade to protect from harsh afternoon sun.
Water consistently, especially during dry spells, for 6 weeks after planting.
Mulch around roots to retain moisture and regulate soil temperature.

Pro Tip

Use organic compost to improve soil acidity and promote healthy growth.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist but not waterlogged 🌱
Prune after flowering to maintain shape
Apply acidic fertilizer in spring

Don't

Avoid overwatering which can cause root rot ❌
Do not expose to direct, intense afternoon sun in hot climates
Refrain from using alkaline fertilizers

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Pest Check
Plant
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vivid shrub for woodland bordersColorful accent in shaded garden beds

Companion Plants

Ferns Hostas Azaleas Camellias Japanese maples

Multiply

Propagation Methods

Good to Know

Common Questions

Flame Azalea questions

What zones can Flame Azalea grow in?

Flame Azalea is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Flame Azalea deer resistant?

Not reliably. Deer may browse Flame Azalea, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Flame Azalea bloom?

Flame Azalea typically blooms in mid-spring through late spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Flame Azalea need full sun?

Flame Azalea does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.