Most fragrant woods are aromatic on their own. Agarwood is different, since the Aquilaria tree that produces it is nearly scentless in its healthy state. The fragrance only exists because the tree was injured.

A wound response, not a natural feature

When an Aquilaria tree is damaged, whether by a broken branch, insect boring, lightning, or fungal infection, it responds the way many trees do: it produces a defensive compound to seal off the wound and stop the damage from spreading. In Aquilaria, that defensive compound is a dark, dense resin. Over months or years, as the tree keeps responding to ongoing fungal activity, resin accumulates in the wood surrounding the wound, gradually replacing the pale, odorless heartwood with the dark, fragrant material we call agarwood or oud.

Why it takes so long

Resin doesn't appear overnight. Low-grade agarwood can form in a few years, but the deeply saturated, high-resin wood used for AAA and sinking grades typically takes a decade or more of continuous infection and response before it reaches that density. That's also why sinking-grade agarwood, resin-dense enough to sink in water, is so rare and expensive: it usually only happens in older trees that have been fighting the same infection for a very long time.

Why not every tree produces it

Not every Aquilaria tree gets infected, and even among those that do, only a fraction develop resin dense enough to be worth harvesting. Historically this meant foragers had to search wild forests and cut into trees just to find out if resin had formed, since there was no way to tell from the outside. That unpredictability is part of why wild agarwood became one of the most valuable raw materials in the world, and why cultivated, inoculated plantations (where farmers deliberately wound trees to trigger the same response) have become an important, more sustainable source in recent decades.

Why this matters when you're buying

Understanding the biology explains a lot about grading and pricing. A chip's grade is essentially a measure of how much genuine resin has replaced the plain wood: more resin means more fragrance, more weight, and a longer, more complex burn. It also explains why fake agarwood is so easy to produce and so different once you know what to look for: dyeing or soaking plain wood can mimic the color, but it can't replicate resin that took a tree years to build.

Every piece we carry is graded by resin content and traced to its region of origin: Kalimantan, Papua, or Sumatra. You can see the grading on each listing in our agarwood chips collection.