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.

Location of Ulmus 'Morton Stalwart' (COMMENDATION™ elm) at the Arboretum