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Patriot elm

Summer foliage of the 'Patriot' elm.

The Patriot elm has excellent resistance to Dutch elm disease (DED), excellent resistance to elm leaf beetles, and some resistance to elm yellows. This complex hybrid is fast-growing, vigorous, and easily established. It has glossy green foliage with yellow fall color. It is useful as street, parkway, or shade tree.

Botanical name:

Ulmus 'Patriot'

All Common Names:

Patriot elm

Family (English):

Elm

Family (Botanic):

Ulmaceae

Planting Site:

  • Residential and parks,
  • City parkway,
  • Wide median,
  • Restricted sites

Tree or Plant Type:

  • Tree

Foliage:

  • Deciduous (seasonally loses leaves)

Native Locale:

  • Non-native

Landscape Uses:

  • Parkway/street,
  • Shade tree,
  • Specimen

Size Range:

  • Large tree (more than 40 feet)

Mature Height:

40-50 feet

Mature Width:

30-40 feet

Light Exposure:

  • Full sun (6 hrs direct light daily)

Hardiness Zones:

  • Zone 5 (Chicago),
  • Zone 6,
  • Zone 7,
  • Zone 8,
  • Zone 9

Soil Preference:

  • Moist, well-drained soil

Tolerances:

  • Dry sites,
  • Occasional drought,
  • Wet sites,
  • Occasional flooding,
  • Alkaline soil,
  • Clay soil,
  • Road salt

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

Flower Color & Fragrance:

  • Inconspicuous

Shape or Form:

  • Oval

Growth Rate:

  • Fast

Transplants Well:

  • Yes

Wildlife:

  • Migrant birds

More Information:

Tree & Plant Care

Do not prune elm trees between mid-April and mid-October.

Disease, pests, and problems

Elm leaf miner and verticillium wilt.

Disease, pest, and problem resistance

This hybrid shows excellent resistance to Dutch elm disease (DED), excellent resistance to elm leaf beetles, and some 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

Simple, alternate leaves, 3 to 4 inches long with toothed margins.  Leaves are medium green in summer, changing to yellow-green in fall.

Flower arrangement, shape, and size

Inconspicuous flowers in early spring.

Fruit, cone, nut, and seed descriptions

Seed in small oval samara (seed case with wings for wind dispersal).

Location of Ulmus 'Patriot' (Patriot elm) at the Arboretum