Lee's Dark Purple Rhododendron

Rhododendron 'Lee's Dark Purple'

Ericaceae · broadleaf evergreen shrub · introduced

Last updated

An upright, compact, rounded evergreen shrub reaching 6 feet in 10 years and 8 to 10 feet at maturity. Broadly funnel-shaped flowers, 2⅓ inches wide, deep royal purple with greenish-brown to ochre marks within, carried in ball-shaped trusses of about 16 blooms. Late-midseason flowering. A hybrid of R. catawbiense crossed with an unknown parent, selected before 1851 by John Lee of Lee and Kennedy Nursery, London (RHS 58). OSU rates flower quality 2-3, plant and foliage 3-4, and performance 4 on a 1-5 scale.

The deepest purple coloration commonly available in elepidote rhododendrons. Catawbiense-derived hardiness and sun tolerance make it tough and adaptable. Hardy to -15°F (Zone 5b-9a). Part sun to full sun on acidic, well-drained soil (pH 4.5-6.0). The moderate flower quality rating (2-3/5 OSU) reflects relatively small individual flowers compared to modern hybrids of similar size, but the color intensity is unmatched. Twenty-one diseases and 15 pests documented at the genus level. All parts contain grayanotoxins and are toxic if ingested.

Plant Profile

Size & Form

Height
6 ft in 10 years
Spread
5-6 ft
Growth Rate
Moderate
Size at 20 yr
8-10 ft
Lifespan
Very long

Site Requirements

Light
Part Sun to Full Sun
Soil Drainage
Well Drained
Soil pH
4.5-6.0
Water
Moderate
Drought Tolerance
Moderate
Hardiness
Zones 5b–9a

Ornamental Interest

Bloom Time
Apr 25-May 10
Origin
Hybrid: Rhododendron catawbiense × unknown. Selected before 1851 by John Lee
Watch for this season

Root Colonization (Spring–Fall)

Gall Development & Sporulation

Active Conidial Spread

RustHigh

Uredinial Stage (Summer)

+ 13 more — see full disease and pest lists below

Diseases: Regionally Documented (21)

Pests: Regionally Documented (15)

Phenological Calendar

View full calendar (5 stages)
Stage Typical Window
Bud swell BBCH 01-03 Mar 15-Apr 15
Bloom start BBCH 61 Apr 25-May 10
Full bloom BBCH 65 May 1-May 18
Bloom end BBCH 69 May 15-Jun 1
Bud set BBCH 55-59 Jul 15-Sep 15
Data Maturity
Baseline Extension data. Expert review underway.