NEW HORIZON ELM - ULMUS DAVIDIANA VAR. JAPONICA X ULMUS PUMILIA

Common Name: New Horizon Elm

Scientific Name: 
Family: Ulmaceae
Genus: Ulmus
Species: Davidiana var. japonica x Ulmus pumilia

Hardiness Zone: 3 to 7
Height: 30 to 40 ft
Width: 15 to 25 ft
 

Common characteristics:

The New Horizon elm is a hybrid species that is a cross between a Japanese elm clone (U. davidiana var. japonica) and a Siberian elm clone (Ulmus pumilia). This tree's most important characteristic is its resistance to Dutch Elm Disease. This elm has a compact upright canopy and can grow to heights of 30' to 40' and become 25' wide. The bark is ridged and furrowed with a gray color. Leaves are oval, pointed leaves, that are 3" to 4" in length. Leaves have doubly serrate margins and are shorter on one side of the center vein than on the other. they will be dark green in summer then changing to yellow in fall.

Where it grows:

Prefers moist and well-drained soils. This elm will tolerate dry sites, alkaline soils, clay soils, and road salts. Prefers full sun to partial shade

How it’s used:

The New Horizon elm makes a great shade tree for parks or lawns. Due to this tree's resistance to Dutch Elm Disease and road salts, it makes a good option for planting in the boulevards. 

Ecosystem services:

Birds and small mammals may utilize elms.  

Where it is native to:

This is a hybrid elm that has been cloned from two elms with separate native ranges. Can grow in Hardiness Zones 3 to 7

Problems:

This cultivar has excellent resistance to Dutch elm disease (DED), elm leaf miner, and verticillium wilt. To maintain tree health, elms should not be pruned between mid-April and mid-October. 

References:

Missouri Botanical Garden. (Plant Finder) Found Online: http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=254118&isprofile=1&basic=Ulmus%20%27New%20Horizon%27

The Morton Arboretum. (Trees & Plants) Found Online: https://www.mortonarb.org/trees-plants/tree-plant-descriptions/new-horizon-elm

Santamour, Frank S.; Bentz, Susan E. (May 1995). "Updated Checklist of Elm (Ulmus) Cultivars for use in North America". Journal of Arboriculture. 21(3): 122-131. Accessed 19 May 2018.

newhorizon-form
new horizon elm form
new horizon elm foliage
new horizon elm twig