Rhododendron
Rhododendron catawbiense hybrids
Family Ericaceae
June trusses the size of bouquets on a shrub that stays green all winter — rhododendron is estate grandeur scaled to a yard, four to twelve feet of glossy evergreen presence. On cold mornings the leaves curl into cigars: a living thermometer, not a distress call.
Native catawba bloodlines make it hardy to zone 4, deer tend to pass it over, and bees visit the trusses. Like its azalea cousins it's toxic through and through — admired, never browsed — so site it away from pets and livestock. Plant it in dappled shade and it becomes an heirloom.
Dappled / morning sun
Moderate water
Slow growth
Deer-resistant
Native to North America
Attracts bees
Juglone-sensitive
From the print shop
Growing rhododendron? Hang it.
Our Plant Library collection carries rhododendron — Rhododendron catawbiense, print Nº 398, “Rhododendron.”
526 designsfrom $12.99white or black backgroundmatte poster, unframed
Will it thrive where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what rhododendron actually needs.
Hardy inZones 4-8Rhododendron · Common problems
Common rhododendron problems
Pests
3 problems on file
- Rhododendron Borer
- Lace Bug
- Weevils (notched leaves)
Diseases
6 problems on file
- Root Rot (the killer in clay)
- Winter Burn
- Bud Blast
- Botryosphaeria Canker
- Iron Chlorosis
- Transplant Shock
Rhododendron · Growing & propagation
Growing rhododendron
- Light
- Dappled / morning sun
Winter-shade prevents leaf burn
- Water
- Moderate
Shallow roots, permanent mulch
Soil- ACID, airy, raised if in clay · pH 4.5 - 5.5
Fertilizer- Acid feed lightly after bloom
Pruning- Rarely needed; deadhead trusses by snapping (careful of buds beneath)
Snap spent trusses sideways; that's the annual ritual.
Spacing- 5-8 ft
How to plant & propagate rhododendron
- Propagate
- Seed (stratify), cuttings, or layering
Rhododendron · Seasonal care & spray guidance
The rhododendron growing playbook
When to spray rhododendron
Growing season. Anti-desiccant spray in December in windy z5 sites; else siting is the medicine.
Rhododendron · Calculators & field guides
A little help in the garden.
Rhododendron · Yearly calendar
The rhododendron year, month by month
Jan
No calendar activity is listed for this month.
BloomBloomMay to June
What each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
Rhododendron · Ecology & uses
Ecology & uses
Rhododendron catawbiense hybrids
Rhododendron in the garden system
- Shrub layer shrub
Attracts- Bees
- Moisture
- Facultative / average
- Deer
- Resistant
A safer unfenced choice
- Origin
- Native to North America
- Juglone
- Rhododendron is sensitive to juglone
The toxin exuded by black walnut, butternut, and their relatives. Keep it 50+ ft from any walnut or hickory, or its leaves will yellow, wilt, and die back for no obvious reason.
What rhododendron is grown for
⚠ Toxic if eatenHIGHLY toxic to pets/livestock
Use- Evergreen structure
- Use
- June show
- Use
- Estate looks
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
Rhododendron · Varieties & cultivars
Choosing a rhododendron variety
'Roseum Elegans' (indestructible lavender); 'Nova Zembla' (red, hardy); 'PJM' (small-leaf, iron-clad z4); 'Cunningham's White'
Sources & plant identity
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Rhododendron
Rhododendron catawbiense hybrids
The plant, at a glance.
- Botanical name
- Rhododendron catawbiense hybrids
- Plant family
- Ericaceae
- Growth habit
- Shrub · Perennial
- Origin
- Native to North America
- USDA plant symbol
- RHCA8
- Invasive risk
- Low
Hardiness, size and timing vary with your cultivar, soil and climate.
Rooted in research.
University extension research, brought together with hands-on growing experience at Story Thyme Farms.
for Rhododendron
Research from these sources
Publisher marks identify sources, not sponsorship or endorsement.
Questions
Rhododendron questions, answered straight.
Do deer eat rhododendron?
Rarely — rhododendron is considered deer-resistant, which makes it one of the safer unfenced choices in deer country. Hungry deer in a hard winter test every rule, but it's a low-risk pick.
Is rhododendron safe for kids and pets?
No — treat it as toxic if eaten. HIGHLY toxic to pets/livestock Site it accordingly if children or pets roam the garden. This is general reference, not medical or veterinary advice — call a vet or poison control if something has actually been eaten.
How do you propagate rhododendron?
Seed (stratify), cuttings, or layering.
Elsewhere
Where rhododendron sits in the library.
Rose
Hydrangea
Common Lilac
Forsythia