Boursault Rhododendron (Rhododendron catawbiense ‘Boursault’) is a robust, broadleaf evergreen shrub admired for its dense growth habit and bold violet-lavender flower clusters. With strong cold hardiness and reliable bloom performance, this cultivar brings vibrant color and year-round presence to partially shaded gardens in northern and mountain climates.
Distinctive Features
‘Boursault’ typically reaches 6 to 10 feet tall and wide, forming a rounded to slightly upright shape with thick, leathery, dark green leaves. In mid to late spring, it produces large trusses of soft violet-purple flowers with faint yellow blotches. A selection of the Appalachian-native Catawba Rhododendron, it is known for its toughness, making it an excellent structural and seasonal accent in acidic garden soils.
Growing Conditions
Sun Exposure: Partial shade; tolerates morning sun in cooler regions
Soil Type: Moist, well-drained, humus-rich soil
Soil pH: Acidic
Water Needs: Moderate; consistent watering preferred
USDA Hardiness Zones: 4 to 8
Ideal Uses
Focal point in shaded woodland borders or large beds
Massed for seasonal interest along woodland edges
Evergreen screen or informal hedge in acidic soil areas
Anchor in mixed rhododendron groupings or native plantings
Backdrops for pollinator and spring-bloom gardens
Low Maintenance Care
Mulch annually to maintain moisture and root health
Prune after bloom to shape and remove spent trusses
Water during summer droughts, especially while establishing
Fertilize in early spring with acid-specific plant food
Protect from drying winter winds in exposed sites
Why Choose Boursault Rhododendron
Soft violet-lavender blooms add richness to spring gardens
Evergreen foliage gives structure and year-round appeal
Cold-hardy and well-suited to challenging climates
Excellent for woodland gardens and traditional plantings
A striking focal point for shaded foundations and borders
Boursault Rhododendron delivers bold seasonal color, reliable evergreen form, and lasting resiliencemaking it an excellent focal point in cool-climate landscapes with acidic soil.
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