How to Identify Tree of Heaven
Spot Tree of Heaven by its pale cream-tan color, bold ash-like ring-porous grain, light weight, satiny sheen, and the tree's notorious foul smell.
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Color and figure first. Tree of Heaven is pale cream to light tan or yellowish throughout, with little contrast between heartwood and sapwood — sometimes a faint greenish or golden tint when fresh. On flatsawn faces the bold, evenly spaced growth rings throw a strong cathedral figure, and the surface has a distinct satiny to glossy luster. If a board looks like light ash but softer and more uniformly pale, Ailanthus is a strong candidate.
Read the end grain. This is the key test. Tree of Heaven is markedly ring-porous: on the end grain you will see a crisp row of large earlywood pores at the start of each growth ring, dropping abruptly to much smaller latewood pores. This gives the same open, banded structure as ash, oak, or chestnut — very different from the uniform speckle of a diffuse-porous wood like maple, cherry, or poplar. Rays are fine and not conspicuous.
Weight and hardness. The wood is light-to-medium and moderately soft — noticeably lighter and softer in the hand than a comparable piece of true ash. It carves and dents more easily than ash or oak, so if a bold ring-porous board feels surprisingly lightweight, that points toward Ailanthus rather than ash.
Smell is a giveaway. Tree of Heaven earns nicknames like "stink tree" and "stinking sumac" for the rank, unpleasant odor of its leaves and green wood. Freshly cut or sanded green stock often carries a distinctly foul, sour smell — very different from the mild or sweet scents of most furniture hardwoods — that fades as the wood dries.
Common look-alikes. The main confusion is with ash (Fraxinus), which shares the pale color and ring-porous grain almost exactly; separate them by weight and hardness (ash is denser, heavier, and harder) and by ash's cleaner, milder smell. Oak is also ring-porous but shows large, conspicuous rays that produce ray fleck on quartersawn faces — Ailanthus lacks these. Chestnut is ring-porous and pale but coarser and browner with more prominent latewood bands, while catalpa and mulberry run greyer or more golden and are usually softer still. When in doubt, the combination of ash-like end grain, light weight, and a foul green-wood odor is close to diagnostic.
Frequently asked questions
How do I tell Tree of Heaven from ash?
They look nearly identical — both pale and ring-porous — so use weight and hardness. Ash is denser, heavier, and noticeably harder; Tree of Heaven is lighter and softer for the same size board. Ash also smells mild or sweet when cut, whereas green Ailanthus can smell foul and rank.
What does the end grain of Tree of Heaven look like?
It is clearly ring-porous: a distinct band of large earlywood pores marks the start of each growth ring, then the pores shrink sharply into the latewood. Rays are fine and inconspicuous, unlike oak's bold rays. This open, banded end grain is the most reliable single feature.
Does Tree of Heaven wood really smell bad?
The tree is famous for it — the leaves and green wood give off a rank, sour odor that earned it names like "stink tree." Freshly cut green lumber often carries this unpleasant smell, which fades as the wood dries. A foul odor on a pale, ash-like board is a strong clue.
Can I confuse Tree of Heaven with oak?
Both are ring-porous, but oak shows large, prominent rays that create ray fleck on quartersawn surfaces and visible radial lines on the end grain. Tree of Heaven has fine, inconspicuous rays and is paler and lighter, so the ray pattern quickly separates the two.
Tree of Heaven identified by the community
Recent Tree of Heaven samples identified with Wood Identifier.
