shrub

Autumn Empress Encore Azalea

Rhododendron 'Robleza'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Shrub

Height

48 inches

Width

36 inches

Light

Full Sun, Partial Sun

Zones

6, 7, 8, 9

Water

Medium

Humidity

Average to high

Lifespan

15-20 years

Native To

Hybrid

Toxicity

All parts are toxic if ingested

The Story

Plant Bio

Encore Azaleas are a group of hybrid rhododendrons known for their remarkable ability to bloom in spring, summer, and fall, providing multi-season color. 'Robleza' (Autumn Empress) features large, semi-double, medium pink flowers. It is a robust, fast-growing variety with glossy green foliage that deepens to bronze in winter.

Bloom Period:

EarlyLate

Uses & Benefits:

The primary benefit is its ability to provide spectacular floral displays for three seasons, unlike traditional azaleas. The semi-double pink flowers are large and showy, and the winter foliage adds a bronze tint to the garden.

Its upright, robust habit makes it ideal for creating a flowering hedge, a foundation planting, or a colorful accent in a mixed border. It is also suitable for growing in large containers.

The extended blooming season provides a long-term nectar source for pollinators like bees, butterflies, and hummingbirds, supporting them from spring through fall.

Marketplace

Where to Buy

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Planting

How to Grow

Select a site with 4-6 hours of sun and excellent drainage.
Amend soil with compost to create acidic, rich conditions.
Dig a shallow, wide hole, planting the root ball slightly high.
Ensure the top of the root ball is 1-2 inches above soil level.
Water well and apply a 2-3 inch layer of pine straw or bark mulch.
Water regularly, especially during the first year and dry periods.

Pro Tip

Fertilize with an azalea-specific formula immediately after the spring bloom cycle to fuel summer and fall flowering.

Keep It Thriving

Care Guide

Do

Plant in acidic, well-drained soil.
Mulch with pine straw or bark to protect shallow roots and retain moisture.
Prune only after the main spring flowering season is over.
Provide consistent water, especially in summer heat.

Don't

Do not plant too deep; this is a common cause of failure.
Avoid letting the soil dry out completely between waterings.
Do not prune in late summer or fall, as this removes flower buds.
Avoid using fertilizers with a high nitrogen content.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Multi-season flowering hedgeStunning foundation plantingAccent in mixed perennial borders

Companion Plants

Hosta Ferns Heuchera Hydrangea Pieris japonica

Multiply

Propagation Methods

Good to Know

Common Questions

Autumn Empress Encore Azalea questions

What zones can Autumn Empress Encore Azalea grow in?

Autumn Empress Encore 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 Empress Encore Azalea deer resistant?

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

When does Autumn Empress Encore Azalea bloom?

Autumn Empress Encore Azalea typically blooms in early 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 Empress Encore Azalea need full sun?

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