Toxic to Pets
moderate Care
big-leaved rhododendron
Rhododendron 'Dark Sister'
Big-Leaved Rhododendron (Rhododendron 'Dark Sister') is an attractive evergreen shrub that produces an abundance of large, glossy, deep purple leaves. This ornamental plant has rich yellow-green flowers that contrast nicely with the dark leaves. Dark Sister Rhododendrons will grow to a maximum height of 6 feet with a 3-foot spread. These plants do best in partial shade and prefer acidic, moisture-retentive soil. Once established, this beautiful and hardy shrub does not require much maintenance and is resistant to deer and rabbit damage. Its gorgeous foliage and flowers make it perfect for use as a landscape plant, and this easy-care species will provide beautiful accents in any garden.
Sunlight
Partial Shade
Water Needs
medium
USDA Hardiness Zones
Zone 5Zone 6Zone 7Zone 8
Hardiness Map
Green areas show climates worldwide where this plant can grow.
Zone 5Zone 6Zone 7Zone 8
Loading map…
Water Every
7-10 days
Sun Needs
partial-shade
Growth
Moderate
Care Level
Moderate
Season
Fall
Sep Oct Nov
Winter
Dec Jan Feb
Spring
Mar Apr May
Summer
Jun Jul Aug
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
—
—
Starts Flowering
Starts Flowering
Starts Flowering
—
—
—
—
—
—
—
Pruning Time
Flowering
How to Propagate
Layering Propagation
Bend stem to soil surface, cover lightly, roots form in 4-6 weeks
Cutting
Take 4-6" cuttings in spring, root in water or moist soil
Grafting Propagation
Join scion to rootstock, bind securely until healed
Division
Divide root ball in spring, replant sections immediately
Seed Propagation
Start seeds indoors 6-8 weeks before last frost date
Is This Plant Right for You?
Consider Carefully:
- •Indoor growing
- •Infrequent watering
- •Homes with pets or children
Bloom Seasons
spring
Pet Safety Warning
Toxicity Level
moderateCare Tips
Light Requirements
Enjoys dappled or limited direct sun—about 2–4 hours of morning or late afternoon light and protection during peak midday sun.
Watering
Keep soil consistently moist but not waterlogged. Water when top inch of soil is dry.
Best Planting Time
Plant in early spring or fall for best results. Blooms in spring.