Pre-planting Points of Care. Soil Type: Prefers rich, moist soils but grows well under a variety of conditions. Seeds can also persist in saturated environments for extended periods with little effect on germination. When choosing a location, keep in mind that the American Elm … The American elm … Elm seeds are round, flat and covered by a thin, paper-like casing that hooks at the top. Leaves are alternate, simple, 4–6 inches long, 2–3 inches wide, broadest at or below the middle with coarse, sawtooth edges. The height and circumference measurements listed here are for the largest-known American elm tree in Georgia. As a species, the elm tree is tall. The American elm was the most popular tree to plant in the booming cities of the 19th century, so that by the 20th century many streets were lined with only elms and were shaded in summer by a cathedral-like ceiling of their branches. The American Elm is a medium to fast grower, averaging 10 to 12 feet in 5 years. Seed pods form as light-green wafer-like pockets, which eventually turn into a pale tan color. The American Elm Tree can reach heights of 60 to 80 feet. These trees are tolerant of drought and urban conditions and do not have a high maintenance cost. The American Elm Tree is used as a street and large lawn tree, the American Elm is a staple tree in American history. It is a deciduous tree, creating a long spreading canopy, and self-pollinating flowers. Most elms bear single seeds about the size of a pea. They are distinctive in appearance. Also called the White Elm. However, American Elm will remain dormant until the next season. Base is uneven. Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, is a species of elm native to eastern North America, naturally occurring from Nova Scotia west to Alberta and Montana, and south to Florida and central Texas.The American elm is an extremely hardy tree that can withstand winter temperatures as low as −42 °C (−44 °F). Seed Collection and Storage. This tree has a high, spreading canopy creating an elegant shape. The American Elm is a classic shade tree. This tree is located on private property. Other species displaying the classic vase shape of the American Elm have been cultivated in recent years. Elm seeds or samaras can be collected from the ground as soon as they fall or directly from the branches. An excellent lawn or street tree. Seeds collected in the spring season will germinate quickly within the same season. It is a stately tree and has a vase-shaped crown and yellow fall colour. Being difficult to propagate, American Elm hybrids have been slow to become available. Seed Pods Specifications. Seeds can germinate under low light conditions although germination success increases under moderate light. Elm seeds form and fall from the trees in springtime soon after flowering. Detailed descriptions, growing information, Dutch Elm resistance and pictures American Elm Trees normally will reach reproductive maturity at around 15 years of age. Elms grow at a moderate rate. American elm seeds typically germinate shortly after they reach the ground, although seed may lay dormant until the following spring. The American Elm, is a disease resistant elm tree that can grow to heights of 100 feet or more, with a trunk averaging around 4 feet in diameter. American Elm samaras fall within 300 feet of the parent tree, while the rock elm samaras fall within 100 to 150 feet of the parent tree. 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