Garden hybrid

This is a garden hybrid, bred from more than one wild species, so it has no single species page of its own.

95 other cultivars

shrub

Autumn Lilac Azalea

Rhododendron x hybrida 'Robles'

The Story

Plant Bio

The genus Rhododendron comprises broadleaf evergreen shrubs native primarily to the Northern Hemisphere, known for their preference for acidic, moisture-retentive soils. Plants in this hybrid group form dense branching structures that produce open, funnel-shaped blossoms across spring and summer.

'Robles' is a compact dwarf evergreen shrub growing three feet tall and three and a half feet wide with single lilac flowers marked by dark purple freckles. It displays a heavy bloom flush in spring followed by repeat flowering into fall, with dull green foliage shifting to bronze during winter.

Uses & Benefits:

Produces lavender to lilac blooms with purple freckles across multiple seasons.

Functions as a low evergreen hedge or dwarf accent shrub in acidic soils.

Attracts nectar-feeding insects, bees, butterflies, and hummingbirds.

Garden hybrid

Bred from more than one wild species, so it has no species page of its own.

Essentials

At a Glance

Plant Type

Shrub

Height

35"

Width

41"

Light

Full Sun, Partial Sun

Zones

6, 7, 8, 9, 10

Water

Moderate

Humidity

Moderate to High

Lifespan

Perennial

Native To

Cultivar of hybrid origin

Toxicity

Toxic to pets and livestock if ingested

Bloom period

Spring – Fall

In flower about 9 months of the year

Planting

How to Grow

Select a site in full sun to partial shade that receives four to six hours of direct daily sunlight.
Prepare humus-rich, acidic soil with a pH between 4.5 and 6.0, avoiding heavy clay areas that retain standing water.
Position the root ball slightly elevated above the surrounding grade to maintain sharp drainage around the stem base.
Spread a two-inch layer of pine bark mulch across the root zone while keeping it clear of the trunk, then water thoroughly.

Pro Tip

Prune lightly directly after the primary spring bloom completes; late-season shearing removes the developing buds responsible for summer and fall reblooming.

Keep It Thriving

Care Guide

Do

Maintain acidic, well-draining soil rich in organic matter.
Apply an acid-forming fertilizer in early spring and late summer.
Keep a two-inch layer of organic mulch around the root zone.

Don't

Do not shear stems into old bare wood lacking leaves, as dormant buds will not sprout.
Do not plant in poorly drained or heavy clay soils that induce Phytophthora root rot.
Do not apply lime or high-phosphorus fertilizers.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Foundation PlantingMass PlantingContainer FriendlyBorder Edging

Companion Plants

Heuchera Pieris japonica Camellia japonica Kalmia latifolia

Multiply

Propagation Methods

Good to Know

Common Questions

Autumn Lilac Azalea questions

What zones can Autumn Lilac Azalea grow in?

Autumn Lilac Azalea is hardy in USDA Zones 6–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Autumn Lilac Azalea deer resistant?

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

When does Autumn Lilac Azalea bloom?

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

Does Autumn Lilac Azalea need full sun?

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