Acer negundo Aureovariegatum - Maple

Acer negundo 'Aureovariegatum' is another variety of maple with variegated ash-like leaves. This variety's leaves are widely and randomly edged with bright yellow to cream, sometimes tinged with pink on young shoots. It is valued for its flexible habit, its almost white young wood, and its slightly smaller growth compared to the species. It is a highly decorative tree from spring to autumn: place it prominently in the garden and don't hesitate to prune it to encourage the production of colourful young shoots. This wonderful maple prefers partial shade to protect its foliage from sunburn.

Acer negundo, also known as Box Elder, American Maple or Negundo Maple, belongs to the Sapindaceae (formerly Aceraceae) family. It is native to the western United States and Virginia, but can be found as far south as Florida, as well as in Canada and Quebec. This robust, light-loving species prefers the vicinity of watercourses and wetlands, but tolerates somewhat dry summers once established. It prefers clay-limestone soils, but can adapt to a wide range of soils that are not too acidic. In nature, Acer negundo forms a wide-crowned tree, reaching a height of 15m (49ft). It is a deciduous tree that loses its leaves in autumn.

The 'Aureovariegatum' variety rarely exceeds 6 to 7m (20 to 23ft) in height and 5 to 6m (16 to 20ft) in width if left unpruned. It can easily be maintained at around 3m (10ft) in all directions, which also encourages the plant to produce decorative rose-coloured young shoots. This small tree has a relatively short and stout single trunk, or sometimes multiple trunks, and relatively low branches if it has enough space. If surrounded by other shrubs or trees, it will tend to grow taller in order to reach the light. Its habit is naturally spreading, somewhat irregular, supported by thin and fragile, brittle branches. Its rough, grey-ash bark cracks over time, taking on a darker grey tone. The young branches are greenish-blue and covered with a white bloom. The leaves, 5 to 10cm (2 to 4in) long, are divided into 3 to 9 ovate leaflets with pointed tips and very toothed edges. They are randomly maculated and bordered in yellow on a bright green background, and turn yellow before falling. The inconspicuous flowering occurs in April-May, at the same time or slightly before the development of the young leaves. It takes the form of thick clusters of female flowers, which are slightly yellowish-green, and long filamentous male flowers. The flowers are followed by clusters of winged fruits called samaras, measuring 3 to 5cm (1 to 2in) in length. The shrub is capable of flowering and fruiting from the age of 3 years.

Acer negundo 'Aureovariegatum', which has somewhat brittle wood, only requires moist soil and a location sheltered from strong winds. It is ideal at the base of large trees to create a medium-sized vegetative screen or to brighten up a corner of the garden. It requires less water than Salix integra 'Hakuro-nishiki' (Dappled Willow), but plays the same role in garden ornamentation. For example, plant it with a Purple Filbert or a Black Lace Elderberry; their dark foliage will highlight its extremely bright foliage. It also looks good as a standalone tree in a medium-sized or even small garden, as long as it is regularly pruned to control its size.

Tip: Remove entirely green branches (sort of suckers) that often spoil its appearance.