Ulmus thomasi
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Hardiness Zone: 3-7 Height: 50-100 feet;15-30 metres Spread: 20-40 feet; 6-9 metres Sun: Full sun to part shade Water: Dry to medium Wildlife: The seeds and buds of rock elm are eaten by deer, rabbits, squirrels, and a variety of birds. Larval host for Mourning Cloak butterfly and Columbia butterfly. Bloom Colour: Green-Brown Tolerates: Compacted soils; nutrient poor soils Culture: Rock elm prefers a deep fertile moist soil in full sun, but can be grown in any soil of moderate quality so long as it is well drained. Noteworthy Characteristics: Rock elm, often called cork elm because of the irregular thick corky wings on older branches, is a medium-sized to large tree with a straight trunk that branches high into an oval crown. It is a relatively fast grower, putting on 12-15 feet of growth in 5 years. On good sites, rock elm may reach 30 metres (100 feet) and 300 years of age. The fall colour is yellow. Garden Uses: Native landscapes