Rhododendron 'Catawbiense Album' Join the RHS today and get 12 months for the price of 9. Cultivars and their differences All cultivars similar to species but vary in flower color. The rhododendron 'Catawbiense Grandiflorum' is very vigorous with a wide, round habit and is fully leafy. The hardy catawba hybrids are derived from R. catawbiense and allied species. The Catawbiense Grandiflorum is a North American species and is one of the most winter hardy species of rhododendrons. Rhododendron catawbiense, commonly called Catawba rhododendron or mountain rosebay, is a large, rounded to spreading, multi-stemmed, broadleaf evergreen shrub that typically grows to 6-10’ (rarely to 20’) tall.It is native to the eastern U.S. from Maryland to Kentucky south to Alabama and Georgia. Feb 12, 2017 - The purpose of the Society is to encourage interest in and to disseminate knowledge about rhododendrons and azaleas. It’s hardy and does well under trees in shady locations. Rhododendron catawbiense, with common names Catawba rosebay, Catawba rhododendron, mountain rosebay, purple ivy, purple laurel, purple rhododendron, red laurel, rosebay, rosebay laurel, is a species of Rhododendron native to the eastern United States, growing mainly in the southern Appalachian Mountains from Virginia south to northern Alabama. Can be 4” to 6” tall. Grows to tree size. Description Rhododendron 'Catawbiense Boursault' This very well-known old rhododenron with wide, upright habit has slightly bumpy leaves. 'Catawbiense Album' is an Ironclad rhododendron bred for cold hardiness by Anthony Waterer of Knap Hill, Surrey, England in the late 1800's. Some also have young leaves and stems covered in a striking woolly coating (indumentum) and some - the deciduous rhododendrons or azaleas - have good autumn colour. Its pale lavender buds open into campanulate, white flowers that have a greenish-yellow blotch. In time we will be adding more details including a description, growing information, advice and photographs. Hybrid Rhododendron Plant Description. Good soil drainage is essential (doesn’t like “wet feet”). This plant is winter hardy to USDA Zones 4-8 where it is best grown in acidic, humusy, organically rich, evenly moist, moisture-retentive but well-drained soils in part shade. A vigorous, very tough old variety, dating from before 1850, and hardy to -30C. Size Information: 2” to 4” Wide – Typically a cutting rooted into a 3” or 4” square container. Size Information: 2” to 4” Wide – Typically a cutting rooted into a 3” or 4” square container. Wood margins. NC State University and N.C. A&T State University work in tandem, along with federal, state and local governments, to The showiest of all spring flowering plants, rhododendrons will produce a wealth of beautiful colourful blooms. VIDEO Created by Elizabeth Meyer for "Trees, Shrubs and Conifers" a plant identification course offered in partnership with Longwood Gardens. This shrub is an important parent of a large number of frost-hardy hybrids.Genus name comes from the Greek words rhodo meaning rose and dendron meaning tree. 'Catawbiense Grandiflorum' _ 'Catawbiense Grandiflorum' is a vigorous, upright, bushy, evergreen shrub with elliptic, leathery, glossy, dark-green leaves and, in late spring and early summer, large, bell-shaped, lilac flowers with yellow to … Rhododendron catawbiense, commonly called Catawba rhododendron or mountain rosebay, is a large, rounded to spreading, multi-stemmed, broadleaf evergreen shrub that typically grows to 6-10’ (rarely to 20’) tall.It is native to the eastern U.S. from Maryland to Kentucky south to Alabama and Georgia. Do not site plants within or near the drip line of trees in the walnut family (most rhododendrons are sensitive to toxic juglones produced by roots of walnuts, butternuts, pecans and hickories). The shiny, rich-green leaves are paler green underneath, providing year round colour and structure in the garden. Description. Woodland gardens. Height 175cm in 10 years. Prefers cool summer temperatures. Suggested uses. This plant is listed in the RHS Plant Finder book. Native to (or naturalized in) Oregon: No. Delivery & Returns. It provides winter cover. David Leach wrote of his visit to see the R. catawbiense on Roan: “No advance description … Plant Habit: Large rounded shrub. Large trusses of mauve flowers with yellow-brown markings at the throat are borne in late spring and early summer. Broadleaf evergreen shrub, 6 ft (1.8 m), habit varies from compact to loose and spreading. 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