Description
Ailanthus – Siris
There are about 6 species in this genus of vigorous evergreen deciduous trees and shrubs. They originate in woodland China and from South East Asia to Australia. They bear large alternate pinnate leaves and small greenish yellow flowers borne in large stalked clusters in leaf axis towards tips of the branches. Male flowers are unpleasantly scented and may cause allergic reaction. Both male and female species are needed to produce fruit. In summer female trees develop masses winged papery fruits that are very decorative.
The name Ailanthus is taken form the Moluccana name ‘ailanto’ for Ailanthus moluccana meaning sky tree, which is reputedly inspired the common name ‘tree of heaven’.
Grow in deep fertile well-drained soil in sun or partial shade in warm temperature areas but will survive in moist climates. Able to adapts to urban areas that will also tolerant hard pruning.
Prone Verticillium wilt fungal, stem galls and Cristulariella rust.
Ailanthus vilmoriniana – Similar to Ailanthus altissima. Have soft prickles that clothe the young branches. The larger leaves are densely downy and bear significantly larger flower clusters and the fruits are larger. Leaves were once used to feed the Chinese silk mouth for the production of shantung silk.
Zones 6-10
