Rhododendron ‘Catawbiense Grandiflorum’

(Grandiflora Catawba Rhododendron)



Hardiness Zones:

 4a  4b  5a  5b  6a  6b  7a  7b  8a  8b

Quick Overview:

Rhododendron catawbiense, commonly called Catawba rhododendron or mountain rosebay, is a large, rounded to spreading, multi-stemmed, broadleaf evergreen shrub that typically grows to 6-10’ (rarely to 20’) tall. It is native to the eastern U.S. from Maryland to Kentucky south to Alabama and Georgia.  Funnel-shaped lavender-pink flowers have green to yellow-brown throat markings. Flowers bloom mid to late spring in compact showy terminal clusters.  ‘Grandiflorum’ is a medium dense cultivar with deep, slightly shiny, green foliage. Its long lasting, large lilac-purple flowers have matching filaments and ginger-brown spotted throats.

Description

Best grown in acidic, humusy, organically rich, medium moisture, moisture-retentive but well-drained soils in part shade to full shade. Prefers a sun dappled shade. Plant in a location protected from strong winter winds. Good soil drainage is essential (doesn’t like “wet feet”). Poor drainage inevitably leads to root rot, therefore raised beds/plantings should be considered in heavy clay soils. Shallow, fibrous root systems (do not cultivate around plants) will benefit greatly from a mulch (e.g., wood chips, bark or pine needles) to help retain moisture and stabilize soil temperatures. Roots must never be allowed to dry out. Acidify soils as needed. Clip off spent flower clusters immediately after bloom as practicable.

Additional information

Common Name

Grandiflora Catawba Rhododendron

Botanical Name

Rhododendron 'Catawbiense Grandiflorum'

Container/Amount

3 gallon

Evergreen or Deciduous

Evergreen

Hardiness Zone

4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b

Growth Rate

Average

Light Requirements

Part-shade, Part-sun, Shade

Height

6-10'

Width

6-10'

Soil Condition

Well-drained

Water Needs

Average

Blooming Period

mid spring

Flower Color

lilac purple

Fragrance

Yes

Foliage Color

green

Deer Resistant

Yes

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