While these trees have demonstrated invasive traits, there is insufficient supporting research to declare them so pervasive that they cannot be recommended for any planting sites. The elm seed bug is an insect that has newly arrived in Colorado that feeds on the seeds of Siberian elm. The fruit produced by the Siberian elm mature in the spring, and consist of ½-¾” winged samaras with deeply notched apexes. Other names for this plant include: Common names: littleleaf elm, dwarf elm The bark is light-gray in color and consists of many irregular furrows. It has three bundle scars and bud tips with reddish-brown hairs. The leaf buds are small and reddish. Elm seed bug cause nuisance problems by moving into buildings in summer and early autumn. The bark is gray-brown bark with furrows at maturity. Twigs and leaves are nearly hairless, with black hairs on the bud scales. Siberian Elm (Ulmus pumila) A fast-growing tree that grows to be 50-70’ tall. Siberian elm (Ulmus pumila) Photo credit: Elizabeth J. Czarapata. Its twigs often have conspicuous reddish flower buds. Slippery Elm (Ulmus rubra) has buds that are two ranked. Fertilization works best in the early spring before the first new growth appears. Form Bruce Marlin CC BY-SA 3.0 Leaves Melburnian CC BY-SA 3.0 Buds Matt Lavin CC-BY-SA 2.0 Bark detail MONGO CC BY-SA 3.0 Elm leaf miner Jeremy Beall CC-BY-SA 2.0 Fruits Thayne Tuason CC BY-NC 2.0 Cultivars / Varieties: Siberian elm Family: Ulmaceae: tree: branch: leaf: buds: bark: flowers : Ulmus pumila has smaller leaves than Ulmus americana (less than 7 cm), the leaf bases are symmetrical or nearly so and the leaf margins are singly toothed. Siberian elms have invasive traits that enable them to spread aggressively. Prune weak or damaged branches each spring before the Siberian elm opens its leaf buds. Review of risks should be undertaken before selecting these trees for planting sites. The flower buds … A fast-growing tree that grows to be 50-70’ tall. With age the bark becomes deeply ridged and furrowed and possesses a very rough, grayish-black and handsome appearance. They do not reproduce indoors. Prune weak or damaged branches each spring before the Siberian elm opens its leaf buds. 6. Siberian Elm (Ulmus pumila) is native to eastern Siberia and northern China. The bark is a light gray (instead of the brown of other elms) and in the summer its leaves are smaller and don't exhibit as much of the asymmetrical base as other elms. Notice the round, plump flower buds pumila: dwarf, according to Jacobson (1996) the botanically typical form of the species is a small-leaved shrub of eastern Siberia and Mongolia (hence dwarf). A cup of Siberian Elm; Hardy to USDA Zone 4 Native to eastern Siberia, northern China, Manchuria, and Korea. The leaf buds are normally ¼” long and divergent from the branch, and the floral buds are large and round in shape. Siberian Elm twig. 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