Rock elm leaves are similar in size and shape to Siberian elm, but its older bark is distinctly ridged and corky, its seeds are hairy, and its crown is narrower than Siberian elm. It's attractive, fast growing and will grow in a variety of soil and climate conditions. You see it growing all through the Midwest and Western part of the United States. From TreeHelp.com, you can buy Ulmus pumila: Siberian Elm Seeds online in the USA at best prices, 30-day returns and free shipping over $100. Siberian Elms are one of the best of all windbreak trees. It is a much more suitable landscaping tree than Siberian elm. The Siberian elm is a popular tree for planting as a windbreak or hedge in Western states with limited rainfall. While these trees have demonstrated invasive traits, there is insufficient supporting research to declare them so â¦ The Siberian elm tree, grows well in dry environments and is cold tolerant down to USDA zone 3. Covid-19 Update free shipping on orders â¦ This tree is easy to grow and tolerates pollution and all soil types. Siberian elms have invasive traits that enable them to spread aggressively. Not many can take the punishment that Siberian â¦ The leaves of American and slippery elm are double or more the size of the leaves of Siberian elm, and are also notably uneven at the leaf base. Check Out The Sacred Plant Co Seed â¦ Chinese elm was also introduced from Asia, but has not been as widely planted. Siberian elm should not be confused with Chinese elm (Ulmus parvifolia), sometimes called lacebark elm because its exfoliating bark forms a patchwork of grey, green, brown and orange.