Rhododendron Blue Diamond

Blue Diamond Rhododendron, Crosfield Hybrid Rhododendron, Rhododendron

Blue Diamond (Rhododendron ‘Blue Diamond’) is an evergreen rhododendron with purple flowers. Its display arrives in the early-to-middle part of the rhododendron flowering season, with the exact timing influenced by local weather. Individual flowers measure about 2 inches across.

The plant develops a dense crown. Its foliage is retained through winter, keeping a leafy framework between flowering seasons. It can provide a flowering focal point within a mixed shrub border or woodland-edge planting.

Choose a sunny position with acidic, humus-rich, well-drained soil. Maintain moisture during establishment and dry weather, and mulch over the root zone without burying the stems.

Size guide
• Height: About 3 ft at 10 years; growth continues afterward
• Width: Allow for the cultivar’s natural branch spread; a verified numerical spread is not available in this reference.

Hardiness
• Approximate cold tolerance: -5°F
• USDA cold-limit equivalent: Zone 6b
This equivalence is calculated from the published temperature rating. Local conditions and summer climate also affect performance.

Best Uses
• Border
• Woodland Gardens
• Accent Plant

Plant type

Broadleaf Evergreen, Evergreen Shrub, Flowering evergreen shrub

Height

3 ft+

Width

4-6 '

Hardiness zones

6b–9

Sunlight

Full Sun

Growth rate

Moderate

Bloom time

Spring to summer

Flower color

Purple

Leaf color

Dark Green

Fall color

Dark Green

Attracts

Bees, Butterflies

Soil

Acidic, Humus rich, Moist well-drained

Landscape use

Accent Plant, Border, Woodland Gardens

Shape

Dense

Bark

Smooth

Fruit

No

Fragrant

No

Deer resistant

No

Salt tolerant

No

Drought tolerant

No

10-year height

3 ft