Elm Tree Variety:Cedar Elm These trees are high maintenance Protect the tree against These trees are high maintenance and need substantial care especially before it establishes itself after planting Slippery Elm Another useful multipurpose tree is the slippery elm (Ulmus rubra)‚ which grows to a height of 60 feet with a broad‚ open crown․ It has a stout dark bark․ These trees are easily identifiable and recognizable by hikers and walkers in the park․ The inner bark of the tree has been used in herbal medicine since antiquity for its demulcent properties․ The leaves are serrated and dark green‚ contrasting with the rough exterior of the bark․ The flowers are small and inconspicuous‚ clustered in groups during the spring months․ Slippery elm thrives in moist‚ fertile‚ well drained soil and attracts a variety of wildlife․ The seeds are eaten by many birds and the tree is hardy․ It makes a fine ornamental and useful tree for its flowers‚ seeds and wildlife value․