The Catawba Rhododendron 'Boursault' (Rhododendron catawbiense) is a species of rhododendron native to the eastern United States, particularly the Appalachian Mountains region. Here are some key features and characteristics of this species:

1. Appearance: Catawba rhododendrons are large evergreen shrubs or small trees that can reach heights of up to 6 to 10 feet, occasionally taller. They have dense, leathery, dark green leaves that are elliptical or oblong in shape and typically around 4 to 8 inches long.

2. Flowers: The flowers of the Catawba rhododendron are showy and range in color from pale pink to deep purple. They appear in clusters at the ends of branches in late spring to early summer, creating a stunning display. The flowers attract pollinators like bees and butterflies.

3. Habitat: This species is typically found in acidic soils in mountainous or hilly areas, often in forests or along stream banks. It prefers partial shade to full shade and moist, well-drained soil.

4. Landscape Use: Catawba rhododendrons are commonly cultivated as ornamental plants in gardens and landscapes. They are often used as specimen plants, in borders, or as a backdrop in woodland gardens. They can also be grown in containers.

5. Hardiness: Catawba rhododendrons are cold-hardy and can tolerate temperatures down to USDA Hardiness Zone 4. They are relatively low-maintenance once established but may benefit from mulching and regular watering during dry periods.

6. Pruning: Pruning of Catawba rhododendrons is generally minimal and should be done immediately after flowering to avoid cutting off next year's flower buds.

Overall, the Catawba rhododendron is valued for its beautiful flowers, evergreen foliage, and ability to thrive in shady, woodland environments. It is a popular choice for gardeners looking to add color and texture to their landscape.