Crataegus grignonensis - Hawthorn

Crataegus x grignonensis, or Grignon Hawthorn, is a small tree with a spreading and sprawling habit, rarely exceeding 6m (20ft) in height and 4m (13ft) in width. Almost devoid of thorns, its branches are covered with grey and then brown bark. It bears tough, matte green foliage that persists for a long time before falling. Flowering occurs in May in the form of numerous fragrant white to pale-pink flowers, gathered in corymbs. In autumn, shiny red fruits appear, which are highly decorative and appreciated by birds. Easy to grow and ornamental, this uncommon tree will find its place in all gardens, even small ones.

Crataegus x grignonensis is the result of cross-breeding between the Virginia Hawthorn or Cockspur Hawthorn (Crataegus crus-galli), a species native to North America, and the Mexican Hawthorn (Crataegus pubescens). It belongs to the large Rosaceae family. The first specimen was discovered in Frankfurt, Germany, in 1873.

This small tree has a long lifespan. It measures approximately 6m (20ft) in height and 4m (13ft) in width at maturity with a spreading and dense habit. The foliage is alternate and deciduous, but can be semi-evergreen in regions where temperatures do not drop below -5°C (23°F) in winter. It consists of simple leaves, 2 to 5cm (1 to 2in) long, with an ovate shape, composed of 2 to 4 lobes. The leaves are dark dull green, with a lighter underside. It produces numerous fragrant white to pale-pink flowers, gathered in dense and flat corymbs. The flower corollas consist of 5 rounded petals and numerous stamens with light pink anthers that turn purple. In September-October, shiny red fruits called "haws" appear, with a diameter of about 1.5cm (1in). They are spherical in shape and are consumed by birds. Its wood is very hard.

Crataegus x grignonensis adapts well to any well-drained soil, even limestone, in a sunny or semi-shaded position. It is hardy and not very demanding. It may eventually require some pruning in February to maintain balance. With its small size, it will fit into gardens of all sizes, either as a standalone tree or integrated into a rural hedge. Resistant to pollution and sea spray, it is an excellent choice for urban or coastal gardens. Its only weakness is its poorly developed root system, which makes it somewhat vulnerable to strong winds. It is best to reserve a wind-sheltered location for it, inside a closed courtyard, near a wall, or at the forefront of a grove.