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Crataegus ×grignonensis

Scientific Name: Crataegus ×grignonensis

Family: Rosaceae

Category: Dicot

Growth:

Duration:

Other Names:

       

Grignon Hawthorn (Crataegus grignonensis)

Crataegus grignonensis, sometimes spelled grignoniensis, is a hybrid hawthorn commonly known as Grignon Hawthorn. It is sometimes referred to as Grignon's Thorn or Canadian Thorn.

Considerations for Pets

  • While often described as almost thornless, this plant is a hawthorn, suggesting the potential presence of some thorns.
  • The plant produces berries that turn red when ripe.
  • The plant develops large leaves that have some persistence through winter.

Considerations for Children

  • While often described as almost thornless, this plant is a hawthorn, suggesting the potential presence of some thorns.
  • The plant produces berries that turn red when ripe.
  • The plant develops large leaves that have some persistence through winter.

Taxonomy and Nomenclature

  • Scientific Name: Crataegus grignonensis (or Crataegus grignoniensis)
  • Common Name: Grignon Hawthorn, Grignon's Thorn, Canadian Thorn
  • Hybrid Origin: A seedling resulting from a cross between Crataegus crus-galli and Crataegus pubescens.

Morphology and Growth Habits

  • A deciduous shrub or small tree, typically growing to approximately 4-6 meters (13-20 feet) in height.
  • Develops a dense and broad vase-shaped crown.
  • Branches have greyish-brown bark.
  • Leaves are oval, somewhat leathery, and a dull green. In some instances, they may be glossy, green and remain on the plant late into the season.
  • Produces white flowers, usually in May.
  • Produces large red berries.

Hardiness

  • Hardy to zone (UK) 5 and is not frost tender.

Ecological Role

  • Flowers are "Good for Bees," suggesting a role in pollinator support.

Quirky Facts

  • The Grignon Hawthorn was developed from a seedling of Crataegus mexicana.
  • This hybrid has been cultivated since 1875 in France.

Further Information

  • RHS (Royal Horticultural Society): Find help & information on Crataegus grignonensis from the RHS.
  • Wikimedia Commons has files related to Crataegus grignonensis (e.g., File:Crataegus grignonensis 2.jpg, File:Crataegus grignonensis 3.jpg).