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HOW THE ARBORETUM INTRODUCTIONS ARE DISTRIBUTED
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American elm anthracnose Arboretum scientists attained a height attractive autumn Camellia cedar-apple rust Chinese elm clusters compact controlled cross crab apple crape myrtle creamy white flowers crown cultivars D.C. area dark green leaves deciduous disease-resistant Dutch elm disease early elm yellows evergreen feet wide fire blight foliage foot spread full sun garden glossy grow hardy to U.S.D.A. Hibiscus syriacus holly hybrids Ilex inches in diameter inches wide indica introduction Lagerstroemia landscape plants landscape tree late leathery leaves turn light London plane London plane tree mature mildew-resistant multiple-stemmed Naragansett nursery trade Ohio oleifera orange-red panicles pear petals pink powdery mildew Pyracantha range of soil red fruit red-purple resistant sandy loam sasanqua seedling selection semi-evergreen September Gem shade trees shrub shrub border Siberian elm soil conditions successfully grown summer superior tepals tolerant tree-type U.S. National Arboretum U.S.D.A. Hardiness Zones U.S.D.A. Zones upright growth habit Viburnum Washington well-drained soil yellow Zones 5b