Toxic to Pets
moderate Care
big-leaved rhododendron
Rhododendron 'Cynthia'
Big-leaved rhododendron (Rhododendron 'Cynthia') is an evergreen shrub with bright green foliage. It produces intensely fragrant, white flowers with purple outlines in late spring. Growing to a height and spread of four to five feet in maturity, this beauty will make a great addition to any garden. It adapts well to various soils and can even be grown in containers. The tolerates some degree of drought and can survive in areas with light shade. Its large glossy leaves and fragrant flowers make it a great choice for any gardener.
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
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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
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Starts Flowering
Starts Flowering
Starts Flowering
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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.