Shrub Tsuga canadensis 'Jeddeloh' [Dwarf Canadian Hemlock] The Jeddeloh Canadian Hemlock is an interesting, mounded, dwarf cultivar that forms a cascade of weeping branches. Adaptable plant, tolerant of both shade and alkaline soils. Foliage browns in dry soil, drying wind, and winter sun in very exposed sites. Does not tolerate long periods of drought. Can be scorched by full sun and temperatures above 95 degrees F. Many minor pest problems, with wooly aldelgids being especially serious in the Northeast US.
Tree Tsuga caroliniana [Carolina Hemlock] Slower growth than Tsuga canadensis and less variable in size and form. Performs better under city conditions than T. canadensis. Still, like T. canadensis, foliage browns in dry soil, drying wind, and winter sun in very exposed sites, and it does not tolerate long periods of drought. Can be scorched by full sun and temperatures above 95 degrees F. Many different kinds of minor pest problems.
Tree Ulmus americana 'New Harmony' [New Harmony Elm] 'New Harmony' is a cultivar of American elm, it has a vigerous growth rate and a more narrow vase shape than other varieties. It has great disease tolerance of Dutch Elm Disease (DED).
Tree Ulmus davidiana var Japonica 'Morton' [sold as Accolade®] [Accolade Elm] Very good resistance to the Dutch elm disease pathogen, Ophiostoma ulmi, which has led to the near extinction of the American Elm (Ulmus americana) in the U.S. Also has good resistance against phloem necrosis, elm leaf beetle, and leaf miner.
Tree Ulmus davidiana var. japonica 'Prospector' [Prospector Elm] 'Prospector' is a cultivar with excellent resistance to Dutch elm disease (DED) and is smaller than American varieties. It is fast-growing and requires maintenance to keep its vase shape, but it works well as a street tree. It has showy emerging leaves and a brilliant yellow fall color.
Tree Ulmus 'New Horizon' [New Horizon Elm] Know to be a compact cultivar, rapid grower, and resistant to Dutch elm disease.
Tree InvasiveThis plant is considered invasive Ulmus pumila [Siberian Elm] Grows under almost any conditions, especially useful in dry sites. Resists Dutch elm disease. Leaf beetles can defoliate trees. Brittle branches and subsequently messy. Avoid planting this tree in the landscape, unless there is no other choice. Considered invasive in many areas.
Tree Ulmus × 'Frontier' [Frontier Elm] Small tree that grows well under city conditions. Good Dutch elm disease resistance and moderate elm leaf beetle resistance.
Tree Ulmus × 'Morton Glossy' [sold as Triumph™] [Triumph Elm] Upright oval to vase-shaped habit with arching branches, glossy dark green summer foliage, changing to yellow in fall; hybrid between Accolade® and Vanguard™. Dutch elm disease resistant, the best habit in early age of the Morton Arboretum elms.
Shrub Viburnum × burkwoodii [Burkwood Viburnum] Trouble-free plant tolerant of soils and pollution (except sulfur). Also, does not tolerate more severe drought. Very fragrant when in bloom, although to a lesser degree than Viburnum carlesii (Koreanspice Viburnum). Bacterial spot and powdery mildew susceptibility (but not always a problem). Sulfur containing pesticides burn or defoliate leaves. Too thin to be a solid screen.
