Essentials
At a Glance
Plant Type
Shrub
Height
48 inches
Width
60 inches
Light
Partial Sun, Shade
Zones
5, 6, 7, 8
Water
Moderate
Humidity
Prefers moderate
Lifespan
Long-lived shrub
Native To
Hybrid
Toxicity
All parts are toxic if ingested
The Story
Plant Bio
Evergreen azaleas are a group within the Rhododendron genus, prized for their spectacular spring floral displays that can completely cover the foliage. They are typically smaller-leaved and more compact than large-leaf rhododendrons. 'Herbert' is a classic Gable hybrid, renowned for its exceptional cold hardiness and profuse display of large, frilled, reddish-purple flowers with a darker blotch. It is a reliable and vigorous performer.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Find a spot with dappled sunlight or morning sun only.
- Dig a wide, shallow hole in acidic, well-drained soil.
- Amend the backfill with organic matter like compost or peat moss.
- Plant with the top of the root ball 1-2 inches above soil level.
- Mulch with 2-3 inches of pine straw or bark.
- Water regularly, especially during the first year and dry periods.
Pro Tip
Amend soil heavily with compost or pine bark fines at planting to create the acidic, well-drained conditions azaleas crave.
Keep It Thriving
Care Guide
Do
- Maintain a consistent layer of acidic mulch.
- Water deeply during dry spells, especially in summer and fall.
- Test soil pH and amend if necessary to keep it acidic.
- Prune lightly right after flowering to encourage bushiness.
Don't
- Don't plant too deep; this is a primary cause of failure.
- Don't let the shallow roots dry out.
- Don't cultivate around the base of the plant.
- Don't use 'weed and feed' fertilizers nearby.
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
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Herbert Azalea questions
What zones can Herbert Azalea grow in?
Herbert 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 Herbert Azalea deer resistant?
Not reliably. Deer may browse Herbert Azalea, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Herbert Azalea bloom?
Herbert 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 Herbert Azalea need full sun?
Herbert Azalea does best in part shade.
More Rhododendron to compare
Catawba Rhododendron
Rhododendron catawbiense
Double White Rhododendron
Rhododendron x hybrida 'Double White'
Great Laurel Rhododendron
Rhododendron maximum
Bone Hardy Azalea
Rhododendron obtusum 'Bone Hardy Azalea Sampler'
Praecox Rhododendron
Rhododendron catawbiense 'Praecox'
Elite Star Rhododendron
Rhododendron x hybrida 'Elite Star'
Keep exploring
Explore the genus
Collections featuring this plant
Hardy in your zone?
Grow Herbert Azalea with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
