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Azalea - Delaware Valley White

Azalea - Delaware Valley White
Azalea - Delaware Valley White Azalea - Delaware Valley White Azalea - Delaware Valley White
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Plant Profile
Botanical Name Rhododendron x 'Delaware Valley White'
Features Upright, open, evergreen shrub with medium, elliptic, olive-green leaves. In midseason, bears loose trusses of open funnel-shaped, fragrant, cream to pale yellow flowers, 3in across, with light pink shading.
Exposure Partial sun
Hardiness Zone USDA Zones 5-8
Mature Size 5' Tall, 3' Wide
Genus Description Rhododendron is a genus of 500-900 species of evergreen and deciduous trees and shrubs, sometimes epiphytic, from Europe, Australasia, North America, and Asia, particularly S.W. China, Tibet, Burma, N. India, and New Guinea. They vary greatly in habit, and may reach a height of 80ft or creep at ground level to form prostrate shrubs. Rhododendrons are grown mainly for their spectacular, sometimes strongly scented flowers, which are borne singly or in lateral or terminal racemes (known as trusses), usually from late winter to late autumn. The individual flowers vary greatly in size and shape, but are usually 5-lobed, and often marked with flares or spots inside, on the upper or lower lobes or in the throats; some also have conspicuous or brightly colored, basal nectar pouches inside. There are thousands of hybrids, encompassing nearly every flower color. In horticulture, rhododendrons are often divided into 5 main groups: large-leaf (elepidote) evergreen rhododen¬drons, small-leaf (lepidote) evergreen rhododendrons, Vireya rhododendrons, deciduous azaleas, and evergreen azaleas. Deciduous and evergreen azaleas are small to medium-leaved shrubs belonging to the subgenera Pentanthera and Tsutsusi, and commonly known to gardeners as azaleas. They bear a profusion of small to large trusses of usually small flowers in a variety of shapes.
Care Tips
Cultivation Outdoors, grow in moist but well- drained, leafy, humus-rich, acidic soil (ideally pH 4.5-5.5). Shallow planting is essential: all rhododendrons are surface- rooting and will not tolerate deep planting. Most large-leaved species and hybrids require dappled shade in sheltered woodland conditions; avoid the deep shade immediately beneath a tree canopy. Avoid frost pockets to reduce the risk of split bark occurring in winter. To conserve moisture and to protect the shallow roots from extremes of heat and cold, mulch annually with a loose, open material, such as pine needles, bark, or chopped oak leaves. After flowering, deadhead where practical, to promote vegetative growth rather than seed production. When deadheading, be careful not to damage or remove young growth emerging from below the flowers. When pruning, trim or lightly cut back shoots that spoil symmetry annually or after flowering. Remove dead and damaged growth in midspring. Dead head regularly if practical.
Pests and Diseases Susceptible to vine weevil, whiteflies, leafhoppers, lace bugs, scale insects, caterpillars, aphids, powdery mildew, bud blast, rust, leafy gall, petal blight, Phytophthora root rot, and lime-induced chlorosis (if the soil is not sufficiently acidic).

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