The leaf of the Tree of Heaven (Ailanthus altissima) is a large, pinnately compound leaf, meaning many smaller leaflets (10-40) are arranged along a central stalk, often 1-3 feet long; the key identifying feature is one or two coarse, glandular teeth at the base of each leaflet, giving crushed leaves and twigs a strong, unpleasant smell. These dark green leaves turn yellow in autumn and fall off, leaving smooth, pale gray bark.
Tree-of-heaven leaflets have smooth (as opposed to toothed) margins, except for one or two lobes called glandular teeth at their base. There is a visually noticeable gland on the underside of these teeth. The twigs on a tree-of-heaven are hairless and can appear greenish, pink, reddish, or brown.
The genus name Ailanthus is derived from the Ambonese word ailanto, meaning "heaven-tree" or "tree reaching for the sky". They use this name for the evergreen tree Ailanthus integrifolia. Altissima is Botanical Latin for "tallest" or "very tall".
Tree of heaven is an invasive woody tree that is widespread across most of Australia. Native to Taiwan and China, tree of heaven was introduced to Australia in the mid-1800s as an ornamental garden plant and shade tree. However, it soon escaped homesteads and naturalised in nearby bushland and pastures.
To summarize, the distinguishing characteristics of tree-of-heaven include pinnately compound leaves, leaflets with smooth edges and glandular teeth at the base, distinctive unpleasant odor, bark resembling the skin of a cantaloupe, stout greenish brown twigs that have a spongy brown pith, and seeds in twisted samaras ...
Tree-of-heaven (Ailanthus altissima), commonly referred to as ailanthus, is a rapidly growing deciduous tree native to both northeast and central China, as well as Taiwan.
Tree of heaven (Ailanthus altissima) and staghorn sumac (Rhus typhina) are both aggressive colonizers of disturbed sites with pinnately compound leaves. They are easily mixed up. Tree of heaven is invasive, sumac is native. Hopefully this helps you ID the two.
MECHANICAL CONTROL: Due to its extensive root system and the ability to aggressively sucker and resprout, eradication of tree-of-heaven is extremely difficult. The correct timing of the treatment, and follow-up maintenance during subsequent years, are critical to eradication success.
The Gympie-Gympie stinging tree is one of the world's most venomous plants and causes extreme long-lasting pain.
CAUTION: May cause phytophotodermatitis where sap touches the skin and is exposed to sunlight; wear long sleeves if handling. Also can easily be confused with the native, yet deadly, poison hemlock. Queen Anne's lace should be reported.
Cogon grass is considered to be one of the top ten worst weeds in the world. Its extensive rhizome system, adaptation to poor soils, drought tolerance, genetic plasticity and fire adaptability make it a formidable invasive grass.
The dried bark from the trunk and root are sometimes used in folk medicine. Tree of heaven is used for diarrhea, asthma, cramps, epilepsy, fast heart rate, gonorrhea, and other conditions, but there is no good scientific evidence to support these uses. In manufacturing, tree of heaven is used as insecticide.
6 of the most invasive plant species in the world
Although lindens are relatively free of pests and disease, crowding the plants or planting in heavier shade can encourage both insect and fungal problems. Wood rot, where the center of the tree hollows out, is a fairly common problem and can weaken the tree over time.
An additional ID characteristic is the odor produced by crushing the leaves, which is described by many as burnt peanut butter. Black walnut is the native tree that is probably most often mistaken for tree-of-heaven. Like the tree- of-heaven the leaves are pinnately-compound and alternate.
This tree could quite easily be confused with the Blackthorn (Prunus Spinosa) or the Sloe bearing tree which does look quite similar. The easiest way to differentiate between these two plants is in spring; as the Hawthorn goes into leaf before flower, the Blackthorn will go into flower before leaf.
Prohibited invasive plants
Poplars are fast growers. Their roots need moisture and will invade any leaky pipe they can find. Depending on the variety, they can grow 50 to 150 feet tall but are brittle and tend to drop limbs and branches. Never plant them near your house.
Deadly Nightshade (Atropa belladonna)
Nightshade contains atropine and scopolamine in its stems, leaves, berries, and roots, and causes paralysis in the involuntary muscles of the body, including the heart. Even physical contact with the leaves may cause skin irritation.
The tree of heaven is a problem because it reproduces very quickly and aggressively inhibits (and can even kill) native plants near it.
The cheapest time of year to have a tree cut down is generally during the winter months (late January to early March), when trees are dormant (no leaves) making them lighter and easier to handle, demand is lower for tree services, and companies may offer discounts to stay busy, potentially saving you 15-20%. If the tree isn't a safety hazard, scheduling during this off-peak season reduces labor and cleanup, lowering costs.
Japanese knotweed is best controlled by the application of a suitable herbicide. Glyphosate-based herbicides are commonly used to treat Japanese knotweed. If glyphosate is applied correctly, at the appropriate time of year, it is possible to eradicate it, although it can take two to three years of repeated treatment.
Herbicide Application Methods
Foliar (leaves), basal bark, and cut-stump application methods all effectively kill tree-of-heaven. Choose the right method for your situation. Only spray herbicide on the foliage of btree-of-heaven when nearby plants can be avoided. The spray could damage plants you want to keep.
Poison sumac is considered the “most toxic plant in the country.” However, on a positive note, it's also much rarer than the others. It only grows in super wet areas, like bogs or swamps.
If the character of a natural area is to be maintained, control of sumac is essential. Sumac is a woody plant that has the potential to form large clones. The shade under these clones can be enough to suppress virtually all native vegetation. It spreads by rhizomes which form a complex underground root system.