Ailanthus altissima seed | Tree of Heaven

LATIN NAME: Ailanthus altissima   COMMON NAME: Tree of Heaven

Botanical Profile

Tree of heaven is native to northeastern and central China, where it grows into a fast, tall tree with large, compound leaves resembling those of a sumac or walnut, each leaflet releasing a strong, distinctive odour when crushed. Clusters of winged, twisted seeds hang in dense bunches through late summer and autumn, and the tree’s exceptional tolerance of poor, compacted or polluted soil has helped it become one of the most widely naturalised trees in the world.

Science & Conservation

Tree of heaven’s remarkable ability to thrive in disturbed urban environments, from cracked pavement to abandoned lots, made it a deliberately planted street tree across many cities through the nineteenth and twentieth centuries, before research revealed the same qualities that made it so useful also made it seriously invasive, outcompeting native vegetation through both aggressive root suckering and allelopathic chemicals released into the surrounding soil. It has also become a major focus of invasive-species research in recent years as the primary host plant for the spotted lanternfly, an invasive pest insect whose North American spread is closely tied to the distribution of this tree.

Landscape & Practical Uses

Historically, tree of heaven’s leaves were the preferred food source for the ailanthus silkmoth, once cultivated for a minor silk industry in parts of Asia and Europe as an alternative to traditional mulberry silk production. Today, however, the species is more often actively removed than planted across much of its introduced range, given its aggressive spread, allelopathic suppression of neighbouring plants, and close ecological link to invasive pest insects, so anyone considering it should check local invasive-species guidance carefully before planting.

Growing From Seed

Fresh seed germinates readily without special pretreatment; sow it into a loose, well-drained mix and keep it lightly moist in a warm, bright position. Given how enthusiastically this species self-seeds and spreads once established, it is worth growing with real intention and awareness of local invasive-species regulations rather than as a casual ornamental choice.

Our Take

Tree of Heaven earns its keep where it is wanted, though we would check regional guidance first, since it can spread further than intended once established. It is also refreshingly straightforward from seed, which makes it a good option even for less experienced growers.

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