Common hawthorn - Crataegus monogyna - click for larger image

English hawthorn identification and control: Crataegus monogyna

Common hawthorn - Crataegus monogyna - click for larger image

English hawthorn, additionally known as frequent, one-seed or single-seed hawthorn, is an launched tree that has naturalized within the Pacific Northwest.  This small tree spreads readily by seed into woodlands and open fields, usually making a dense, thorny thicket.  Its plentiful crimson berries are enticing to birds and different animals, which assist unfold this tree far past the place it’s planted.

In King County, Washington, English hawthorn is classed as a Non-Regulated Noxious Weed and its management is advisable in pure areas which are being restored to native vegetation and in protected forest lands and wilderness areas. English hawthorn can be a nuisance species in pastures and wildlife grazing areas and its removing from these areas can be advisable. This species will not be on the Washington quarantine listing and there’s no restriction on its sale or use in landscaping. For extra data see Noxious weed lists and legal guidelines or go to the web site of the Washington State Noxious Weed Management Board.

Identification (see beneath for extra images)

  • Thorny, deciduous small tree or shrub, 6 to 30 ft tall
  • Leaves three to 7-lobed, 1-2 inches lengthy and practically as broad, resemble mittens or paws
  • Flowers grouped in broad, dense, flat-topped clusters and resemble cherry or apple blossoms
  • Petals are normally white, typically pink
  • Common hawthorn - Crataegus monogyna - click for larger image

    Fruit is a spherical, crimson berry that usually persists into late winter 

  • Just like different decorative hawthorn species and sometimes varieties hybrids which have intermediate traits

Copy and unfold

  • Berries are dispersed by birds and different animals
  • A single tree can produce over 2,000 berries
  • Flowers in spring and develops fruit within the fall; berries usually persisting into the winter
  • Seeds passing by way of an animal aids germination however is not obligatory
  • Germination happens primarily in spring
  • Most vegetative progress happens in spring and early summer season, and regular progress price is one to 2 ft a yr

Impacts and distribution

Common hawthorn - Crataegus monogyna - click for larger image

English hawthorn is carried by birds into forests and open fields the place it could actually type dense, thorny thickets that outcompete native species and make passage of enormous animals tough. Considerably tolerant of shade in addition to drought, English hawthorn invades each open fields and woodlands in Washington, Oregon and California. English hawthorn has naturalized on each coasts of North America and in most of the states in central and jap United States, in addition to components of Australia, New Zealand and South Africa. Though extra frequent west of the Cascades, English hawthorn has unfold in jap Washington as effectively.

English hawthorn is mostly a forest understory species in its native vary, however in our area its grows effectively in a variety of habitats.  Riparian areas, deserted fields and pastures, shrub lands and grasslands, oak woodlands, and different forested habitats are all weak to invasion by English hawthorn.

Launched beginning within the 1800’s, English hawthorn seems to have begun spreading first in Oregon and southern Washington.  Naturalized specimens had been collected in Oregon within the early 1900’s and one assortment from Wahkiakum County, Washington in 1927 notes that the species was generally established alongside roadsides.  For extra data on English hawthorn distribution, see the UW Burke Museum web site.


  • Common hawthorn - Crataegus monogyna - click for larger image

    Seedlings and younger saplings could be pulled or dug up when soil is moist, however roots rapidly grow to be deep and stout and sharp thorns are current even on younger seedlings.

  • Mature bushes have deep and in depth roots so digging is labor-intensive and ends in appreciable soil disturbance if all the roots are eliminated.
  • English hawthorn usually stump-sprouts, so removing by chopping alone will not be normally efficient.
  • Making use of herbicide with the reduce stump or frilling technique might be the best strategy for vegetation that can’t be eliminated by digging or grubbing out the roots. Foliar herbicide therapy is another choice however could end in spray drift to fascinating vegetation.

What to do should you discover this plant

As a result of English hawthorn is already naturalized in lots of locations in King County, we’re not monitoring areas.

Common hawthorn - Crataegus monogyna - click for larger image

Nevertheless, if you realize of any closely infested pure areas in state or federal forests or different distant pure areas, we might be excited by having that data. Please observe that English hawthorn is authorized to promote and plant in Washington.

Extra data on English hawthorn

English hawthorn images

Common hawthorn - Crataegus monogyna - trunk
Common hawthorn - Crataegus monogyna - leaves
Common hawthorn - Crataegus monogyna - flowers
Common hawthorn - Crataegus monogyna - flowers and berries

A few of the images on this web page are courtesy of Ben Legler. Please don’t use these pictures with out permission from the photographer.  Different images not in any other case labeled could also be used for instructional functions, however please credit score the King County Noxious Weed Management Program.

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