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TREES & plants

COMMENDATION™ elm

COMMENDATION™ elm showing fall color.

This fast-growing cultivar is extremely tolerant of drought and cold. The COMMENDATION™ elm is resistant to Dutch elm disease (DED) but moderately susceptible to insect problems, notably elm leaf beetle, Japanese beetle, and gypsy moth. Use along streets and in large yards. The Morton Arboretum introduced this cultivar through Chicagoland Grows®.

Botanical name: 
Ulmus 'Morton Stalwart'
All Common Names: 
COMMENDATION™ elm
Family (English): 
Elm
Family (Botanic): 
Ulmaceae
Tree or Plant Type: 
  • Tree
Foliage: 
  • Deciduous (seasonally loses leaves)
Native Locale: 
  • Non-native
Planting Site: 
  • Residential and parks, 
  • City parkway, 
  • Wide median, 
  • Restricted sites
Landscape Uses: 
  • Parkway/street, 
  • Shade tree, 
  • Specimen
Size Range: 
  • Large tree (more than 40 feet)
Mature Height: 
50-60 feet
Mature Width: 
40-50 feet
Light Exposure: 
  • Full sun (6 hrs direct light daily)
Hardiness Zones: 
  • Zone 4, 
  • Zone 5 (Chicago), 
  • Zone 6, 
  • Zone 7, 
  • Zone 8, 
  • Zone 9
Soil Preference: 
  • Moist, well-drained soil
Acid Soils: 
  • Tolerant
Alkaline Soils: 
  • Tolerant
Salt Spray: 
  • Tolerant
Soil Salt: 
  • Tolerant
Drought Conditions: 
  • Tolerant
Poor Drainage: 
  • Tolerant
Ornamental Interest: 
  • Fall color
Season of Interest: 
  • Early fall, 
  • Mid fall
Flower Color & Fragrance: 
  • Inconspicuous
Shape or Form: 
  • Oval, 
  • Vase-shaped
Growth Rate: 
  • Fast
Transplants Well: 
  • Yes
Wildlife: 
  • Migrant birds
More Information: 

Tree & Plant Care

Prefers a moist, well-drained soil.
Do not prune elm trees between mid-April and mid-October.

Disease, pests, and problems

May be attacked by gypsy moth, Japanese beetle and elm leaf beetle.

Disease, pest, and problem resistance

Very good resistance to Dutch elm disease and resistance to elm yellows.

Native geographic location and habitat

Of hybrid origin.

Bark color and texture 

Bark is gray, ridged and furrowed.

Leaf or needle arrangement, size, shape, and texture

Alternate leaves with toothed edges; shiny dark green in summer.
Fall color is yellow.

Flower arrangement, shape, and size

Flowers are green and inconspicuous, appearing in early spring.

Fruit, cone, nut, and seed descriptions

Seeds enclosed in a flat, circular wing.

Ulmus 'Morton Stalwart' or COMMENDATION™ elm