Ramapo Rhododendron

Rhododendron 'Ramapo'

Ericaceae · broadleaf evergreen shrub · introduced

Last updated May 13, 2026

A broadleaf evergreen dwarf shrub reaching 2 ft tall and 2 to 4 ft wide, taller in shade. Distinctive for foliage that changes color through the year: new growth emerges dusty gray-blue, matures to dark green, and turns deep metallic color in winter. Flowers are light violet-purple. Hardy to -25F.

Full sun on acidic, well-drained soil. Medium growth rate. Among the hardiest dwarf lepidote cultivars in the trade. The seasonal foliage color changes provide year-round ornamental interest beyond the spring bloom period. Twenty-one diseases and 15 pests documented at the genus level.

Quick Facts

Height

2 ft

Spread

2-4 ft

Growth Rate

Medium

Light

Full Sun

Soil

Well Drained

Water

Moderate

Cylindrocladium Blight and Root RotHigh

Root Colonization (Spring–Fall)

Leaf and Flower GallHigh

Infection at Bud Break

Ovulinia Petal BlightHigh

Apothecia Formation & Spore Release

RustHigh

Aecial Stage (Alternate Host)

+ 13 more — see full disease and pest lists below

Diseases: Regionally Documented (21)

Root Rot (Phytophthora spp.) Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew Ovulinia azaleae Ovulinia Petal Blight Lime-induced Chlorosis Symptom category — not a single disease Leaf Spot Exobasidium vaccinii Leaf and Flower Gall Cylindrocladium scoparium Cylindrocladium Blight and Root Rot Botrytis Petal Blight Multiple soilborne and waterborne pathogens cause cutting... Cutting Rots Leaf Burn Ramorum Blight (Sudden Oak Death) Botryosphaeria dothidea Botryosphaeria Dieback Seifertia azaleae Bud Blight Rhododendron necrotic ringspot virus Necrotic Ringspot Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust Taphrina wiesneri Witches' Broom Armillaria spp. — primarily A Armillaria Root Rot Pestalotiopsis sydowiana Gray Blight Physiological leaf spot Phytophthora Blight Tylenchorhynchus claytoni Nematode, Stunt

Pests: Regionally Documented (15)

Tetranychidae Spider mite Otiorhynchus spp. Root weevil Choristoneura rosaceana Obliquebanded Leafroller Caloptilia azaleella Azalea leafminer Stephanitis pyrioides Azalea Lace Bug Acanthococcus azaleae Azalea bark scale Aphidoidea Aphid Lepidoptera Caterpillars Parthenolecanium spp. Lecanium scale Stephanitis rhododendri Rhododendron lace bug Dialeurodes chittendeni Rhododendron whitefly Nematus lipovskyi Azalea sawfly Cacoecimorpha pronubana Carnation tortrix Icerya purchasi Cottony cushion scale Coleotechnites huntella Rhododendron bud moth

Data Maturity

Structured Multiple sources. Expert review underway.