Students for Stewardship The Cork Board
← Back to the library

Ramapo Rhododendron

Rhododendron (rho-doh-DEN-dron roh-MOP-oh)

Family: Ericaceae Unknown Shrub (3-15 ft)

‘Ramapo’ rhododendron is a very compact, woody, broadleaf evergreen shrub in the Ericaceae (blueberry) family. It typically grows 1 to 3 feet tall and 2 to 4 feet wide. The genus name derives from the Greek words rhodo , which means rose, and dendron , meaning tree. ‘Ramapo’ grows well in full sun to partial shade and prefers moist, well-drained, acidic soils. It does not tolerate dense clay, so if you have clay soil, amend with organic material. The roots may rot if soil does not drain well. Plant the root ball high in the soil to help with drainage issues. Avoid overwatering and over-fertilizing. Pruning, if desired, may be done after flowering. This beautiful dwarf rhododendron has fragrant leaves and large trusses of lovely purple spring flowers that provide a beautiful contrast to the green foliage and attract bees and hummingbirds. It is perfect for small gardens in cool, damp climates or planted in containers and used in interiorscapes. This diminutive shrub is a terrific choice when a small accent plant with great presence is needed. It is equally well suited for a low hedge or planted in a woodland area. Insects, Diseases, and Other Plant Problems: Potential insect problems include aphids, borers, galls, lace bugs, scale, leafhoppers, mealy bugs, thrips, whiteflies, and mites. Disease problems include powdery mildew, blights, root rots, and leaf spots. While rhododendrons remain very popular for landscape use, many cultivars are susceptible to phytophthora root rot—this leads to leaf loss, reduced vigor, branch dieback, and wilting. Implement good cultural practices first, such as improving drainage with organic matter or berms and avoiding overwatering or overfertilization. For suitable alternatives, see this video created by Charlotte Glen as part of the Plants, Pests, and Pathogens series. VIDEO Created by Elizabeth Meyer for " Trees, Shrubs and Conifers, " a plant identification course developed in partnership with Longwood Gardens. More information on Rhododendron .

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 50 attributes.

How it fits the guild

Guild layer 3 - Shrub (3-15 ft) Optimal soil pH Acid (<6.0)
See companions & conflicts ↓

Companions & Conflicts

Curated pairwise relationships between this plant and others in the library — who feeds whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.

No curated interactions recorded for this species yet.

Also noted by NC State

Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.

Often confused with Edgeworthia chrysantha
Fills a similar niche Rhododendron Rhododendron eriocarpum Rhododendron 'Windbeam'
Similar, less problematic Abelia x grandiflora 'Kaleidoscope' Abelia x grandiflora 'Rose Creek' Camellia sasanqua Ilex cornuta 'Dwarf Burford'

Full plant profile

Growing Conditions
Plant type
Perennial; Poisonous; Shrub
Life cycle
Woody
USDA zones
5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
Light
Full sun (6 or more hours of direct sunlight a day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil texture
High Organic Matter
Soil pH
Acid (<6.0)
Soil drainage
Good Drainage
Mature size
Height: 1 ft. 0 in. - 3 ft. 0 in. | Width: 2 ft. 0 in. - 4 ft. 0 in.
Growth rate
Medium
Canopy layer
3 - Shrub (3-15 ft)
Form & Appearance
Habit / form
Mounding
Foliage
Broadleaf Evergreen
Leaf color
Blue; Gray/Silver; Green
Leaf type
Simple
Leaf arrangement
Alternate
Leaf margin
Entire; Serrate
Leaf feel
Smooth
Leaf value
Fragrant
Hairs present
No
Leaf detail
Alternate, simple, smooth- or toothed-margined, entire, glaucous blue-green to gray-green leaves; new growth is blue-gray; aromatic when crushed
Flower color
Blue; Gold/Yellow; Pink; Purple/Lavender; White
Flower shape
Tubular
Flower detail
Terminal cluster, tubular, 5-parted, white to deep pink or Bright pinkish violet-blue flowers on a small truss in spring yellow
Bloom time
Spring
Fruit type
Capsule
Fruit detail
Elongated capsule.
Wildlife & Ecology
Native status
Unknown
Wildlife value
Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli. Attracts pollinators and specialized bees.
Attracts
Pollinators; Specialized Bees
Food & Medicine
Fruit type
Capsule
Landscape Use
Landscape location
Container; Small Space; Woodland
Landscape theme
Asian Garden
Design feature
Accent; Hedge
Garden tags
#specialized bees #native bees #evergreen #nectar plant #pollinator plant #problem for dogs #problem for horses #problem for cats #bee friendly #interiorscape #showy flowers #fragrant leaves #container plant #dwarf #purple flowers #small spaces #poisonous #understory shrub #low hedge #wildlife friendly #woodland #accent
Problems & Resistance
Insect problems
Pests of Rhododendron; Rhododendron Lace Bug; Rhododendron Gall Midge; Rhododendron Gall Midge; Rhododendron Borer; Arthropod Pests of Rhododendron
Problems
Poisonous to Humans; Problem for Cats; Problem for Dogs; Problem for Horses
Poison severity
Low
Poison parts
Bark; Flowers; Fruits; Leaves; Roots; Sap/Juice; Seeds; Stems
Poison symptoms
While the plants are known to contain toxins, ingestion of moderate amounts of azalea (nectar or leaves) poses little toxic hazard.
Toxic principle
Grayanotoxins
Contact dermatitis
Yes
Toxicity summary
Low severity poison; parts: Bark; Flowers; Fruits; Leaves; Roots; Sap/Juice; Seeds; Stems; contact dermatitis

Planted at Hunnicutt

Nobody’s planted this one yet.