shrub

Autumn Bonfire Azalea

Rhododendron 'Roblen'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Shrub

Height

36 inches

Width

42 inches

Light

Full Sun, Partial Sun

Zones

6, 7, 8, 9

Water

Moderate

Humidity

Moderate to high

Lifespan

Long-lived shrub

Native To

Hybrid origin

Toxicity

All parts are toxic if ingested

The Story

Plant Bio

Encore Azaleas are a group of hybrid rhododendrons celebrated for their ability to bloom repeatedly from spring through fall. They are evergreen, sun-tolerant, and come in a wide variety of colors and sizes. 'Autumn Bonfire' (Roblen) is a compact, dwarf variety that produces an incredible number of true-red, semi-double flowers. Its manageable size and prolific reblooming make it perfect for containers, borders, and mass plantings.

Bloom Period:

EarlyLate

Uses & Benefits:

Autumn Bonfire provides an unparalleled, multi-season display of vivid red flowers, offering brilliant color when most other shrubs have finished blooming. Its compact, evergreen form provides year-round structure.

Its dwarf size makes it incredibly versatile for use in foundation plantings, small garden spaces, decorative containers, and for creating low, colorful hedges or borders.

The flowers provide a valuable nectar source for pollinators like bees and butterflies, especially during the late summer and fall when other food sources may be scarce. Hummingbirds are also attracted to the red blooms.

Marketplace

Where to Buy

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Planting

How to Grow

Select a site with 4-6 hours of sun and acidic, well-drained soil.
Dig a hole twice as wide as the pot and just as deep.
Amend the backfill soil with compost or fine pine bark.
Gently loosen the root ball and place it in the hole.
Ensure the top of the root ball is slightly above soil level.
Water thoroughly and apply a layer of acidic mulch.

Pro Tip

Plant high, with the top of the root ball 1-2 inches above the surrounding soil, to ensure excellent drainage.

Keep It Thriving

Care Guide

Do

Provide consistent water, especially during the first year and in summer heat.
Maintain a 2-3 inch layer of acidic mulch like pine straw.
Fertilize after the spring bloom with a product for acid-loving plants.
Prune only as needed for shaping right after the spring bloom.

Don't

Do not plant in heavy, alkaline, or poorly drained soil.
Avoid letting the root ball dry out completely.
Don't prune late in the season, as this will remove fall flower buds.
Don't cultivate around the base, as azaleas have shallow roots.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vibrant mass planting for season-long colorCompact foundation shrubStunning container specimen

Companion Plants

Hydrangea macrophylla Heuchera sp. Hosta sp. Ferns Loropetalum chinense

Multiply

Propagation Methods

Good to Know

Common Questions

Autumn Bonfire Azalea questions

What zones can Autumn Bonfire Azalea grow in?

Autumn Bonfire Azalea is hardy in USDA Zones 6–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Autumn Bonfire Azalea deer resistant?

Yes — Autumn Bonfire Azalea is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Autumn Bonfire Azalea bloom?

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

Does Autumn Bonfire Azalea need full sun?

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