City Trees

March/April 2023

City Trees is a premier publication focused on urban + community forestry. In each issue, you’ll learn how to best manage the trees in your community and more!

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Page 43 of 43

44 CityTREES retention of this form. The leaves are a classic elm shape, and New Horizon has a fairly dense canopy. It may be that the rapid growth will lead to a reduced wood resilience at maturity; as yet this has not been reported, but it is a consideration for planting in high-occupancy areas. We have observed that New Horizon requires little to no pruning. In the UK, New Horizon provides leaves well into the fall with an attractive golden-yellow colour, which is an unexpected bonus. Trials along our streets and in parks have not shown any early pest or disease issues. The cultivar has an upright habit and can grow in sun or partial shade. It is cold hardy to RHS Zone H7 (-20°C) and USDA Zone 6b (-5°F). It can achieve approximately 12 meters (39 feet) in height and 8 meters (26 feet) in width. Whilst we may never replace the huge and regal elms lost in the 70s, New Horizon looks like an effective attempt at restoring a species largely lost for a generation. (above) An established young 'New Horizon' elm. Photo Courtesy J. Frank Schmidt & Son Co. (below) Brunswick Park Arboretum's young 'New Horizon' elms in spring, summer, and fall. Photos by Ian McDermott

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