SelecTree: Tree Detail
Ulmus 'Morton Accolade'
Photo Locations: Menlo Park, CA
Highly resistant to Dutch Elm Disease, Elm Yellows, and Elm Leaf Beetle.This tree is of hybrid origin between Ulmus davidiana var. japonica and U. wilsoniana 'Morton' developed at the Morton Arboretum in Lisle, Illinois.
Erect or Spreading and requires ample growing space.
Rounded, Umbrella or Vase Shape.
Has Deciduous foliage.
Height: 50 - 60 feet.
Width: 25 - 40 feet.
Growth Rate: 36 or More Inches per Year.
Longevity Greater than 150 years.
Leaves Obovate, Dark Green, Yellow, Deciduous.
Flowers Inconspicuous. Green. Flowers in Winter. Has perfect flowers (male and female parts in each flower).
Brown or Mostly Green Winged Seed, Small (0.25 - 0.50 inches), fruiting in Spring.
Bark Dark Brown or Dark Gray, Exfoliating, Furrowed or Ridged.
Shading Capacity Rated as Dense in Leaf.
Shading Capacity Rated as Moderate out of Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 2 - 9 and 14 - 21.
USDA Hardiness Zones 4 - 9.
Exposure Full Sun to Partial Shade.
Moist but Well Drained Soil.
Clay, Loam or Sand Texture.
Acidic to Alkaline Soil pH.
Salinity Tolerance is Moderate.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Resistant to Elm Leaf Beetle and Dutch Elm Disease and Phloem Necrosis (Elm Yellows). Susceptible to Aphids, Borers, Beetles, Scale, Leaf Miner, Mealy Bugs, and Caterpillars, Armillaria, Phytophthora, Root Rot, Sooty Mold, Verticillium, Phloem Necrosis, Wetwood.
Health, Safety & Environmental Concerns
Branch Strength Rated as Medium Weak
Root Damage Potential Rated as High.
Allergy Health Hazard.
Biogenic Emissions considered Low.
Desirable Wildlife Plant.
Attracts Birds and Squirrels.
Special Uses & Values
Street Tree, Shade Tree, Park Tree.
Cite this tree:
SelecTree. "Ulmus 'Morton Accolade' Tree Record." 1995-2019. Jul 23, 2019.
< https://selectree.calpoly.edu/tree-detail/ulmus-morton-accolade >