What Is Agarwood?

Agarwood is a dark, resin-infused wood that forms inside certain tropical trees after they are wounded or infected. The resin itself is what people are actually after. It is intensely fragrant, and it is the reason a small chip of this wood can sell for more than its weight in gold.

Most trees never produce it at all. The ones that do are usually species in the genus Aquilaria, and to a lesser extent Gyrinops, both native to the rainforests of South and Southeast Asia. Healthy heartwood from these trees is pale, light, and largely odorless. It is only after the tree suffers some kind of injury, whether from a storm, an animal, an insect, or a fungal infection, that the transformation begins. The tree responds to that damage the way many plants do, by producing a defensive resin meant to seal the wound and resist the spread of infection. In Aquilaria and Gyrinops trees, that resin happens to be aromatic, dense, and dark. Over months or years, it saturates the surrounding wood fibers, and what was once plain timber becomes agarwood.

This is why agarwood cannot simply be planted and harvested like most timber. The tree has to be hurt first, and then it has to be given time, often many years, for the resin to develop and spread through the wood. Wild trees that happen to survive an injury and slowly resin over decades are the source of the rarest and most expensive material. Plantation growers have developed ways to deliberately wound or inoculate trees to speed the process along, but even induced resin formation still takes years, not weeks.

Two Genera, Not One Species

Agarwood is not produced by a single tree. Aquilaria is the larger of the two main genera, with around twenty recognized species spread across South and Southeast Asia, from northeastern India through Vietnam, Cambodia, Laos, Thailand, Malaysia, and Indonesia. Because Aquilaria trees tend to grow faster than their Gyrinops relatives, they are the species of choice for most commercial plantations, including the large-scale operations now common across Vietnam and Indonesia.

Gyrinops is a smaller genus, with roughly eight to nine recognized species, and its natural range sits further east, concentrated in eastern Indonesia and New Guinea. Gyrinops trees grow more slowly than Aquilaria, which has made them less attractive for large plantations and harder to study in the wild, since the regions where they grow naturally tend to be more remote. Despite the slower growth, resin from Gyrinops species is valued by many traders and is increasingly part of the legal plantation supply coming out of eastern Indonesia.

Both genera belong to the same plant family, Thymelaeaceae, and both were brought under CITES protection together, but they are genetically distinct, and resin character can vary meaningfully between them. The differences between specific species and growing regions are covered in detail in our origins and varieties guide.

How Agarwood Actually Forms

The mechanism behind agarwood formation has been studied closely by botanists and chemists, and the broad picture is well established. When an Aquilaria tree is wounded, whether by mechanical damage or by fungal colonization, it triggers a cascade of biochemical defense responses inside the tree. Researchers have identified specific compounds at the center of this process, particularly sesquiterpenes and a class of molecules called 2-(2-phenylethyl)chromones, both of which accumulate at the site of injury and give agarwood its distinctive scent profile. Fungal infection appears to play an especially significant role in this process, with certain fungal species shown to trigger or accelerate the tree's resin production as part of its defense against the infection itself.

The result of this slow biochemical process is heartwood that has changed both in appearance and in composition. Where uninfected wood is light and relatively uniform, resin-infused agarwood develops dark, often blackened streaks and patches, sometimes covering the entire piece if the resin saturation is high enough. Collectors and traders often describe high-resin pieces as feeling slightly oily or waxy to the touch rather than dry like ordinary wood, and as carrying a faint scent even before burning, often described as something between woodsmoke and dried fruit, though individual pieces vary considerably and scent description is inherently subjective. The wood becomes denser too.

This is the basis of one of the oldest and most reliable tests traders still use today. It is also the origin of the most common names for this material across Asia, several of which translate directly to "sinking incense," a description of exactly this property.

Agarwood the Wood, Oud the Oil

One source of confusion for new buyers is the relationship between agarwood and oud. In most of the world, oud and agarwood refer to the same raw material, the resin-infused wood itself, and the terms are used interchangeably depending on regional language rather than describing two different things. Where it gets more specific is in Western retail and perfumery, where oud oil refers to a particular product made from agarwood rather than the wood itself.

Oud oil is produced by distilling agarwood, typically through a soaking and steam distillation process that extracts the aromatic compounds from the wood into an oil. That oil is what ends up in many modern perfumes labeled with oud as a fragrance note, and it is also burned, worn directly on the skin, or used in attars across the Middle East and South Asia. Agarwood chips and oud oil are different formats of the same underlying resin, suited to different uses, and the choice between them is largely a matter of preference and intended use rather than one being a more authentic version of the other. The practical differences between buying chips versus oil are covered in more detail in our buying guide.

The Many Names for One Material

Agarwood goes by a long list of names, and almost none of them are interchangeable in a way that tells you anything about quality or origin. They are simply what different cultures and trade languages have called the same resinous wood for centuries.

In Arabic, it is oud, sometimes spelled oudh, a word that literally means wood. This is the term most familiar to Western buyers today, largely because of its prominence in Middle Eastern perfumery, where oud oil and oud-based fragrances have become a major global category. In Indonesia and Malaysia, the material is called gaharu. In Chinese, it is chen xiang, and in Japanese, jinko, both of which translate to something close to sinking incense or sinking fragrance, a direct reference to the density test described above. In Vietnamese, it is tram huong. Older English botanical texts sometimes refer to it as aloeswood, lignum aloes, or eaglewood, terms that occasionally appear in translations of religious texts but are uncommon in modern trade.

None of these names refers to a different species or a different grade. They are regional and linguistic variations describing the same underlying material, though the specific trade customs, grading systems, and preferred styles of use do vary significantly from one region and culture to another, a distinction covered in more depth in our regional guides.

Why Agarwood Commands Such High Prices

Several factors compound to make high-grade agarwood among the most expensive natural materials traded by weight, with top-quality wild material having sold for tens of thousands of dollars per kilogram. Formation is slow and depends on chance injury or deliberate, time-intensive inoculation. Not every tree produces resin even after wounding, and the agarwood industry has long understood that the amount of available tree stock is not the same thing as the amount of usable resin that stock will actually yield. Wild agarwood, where a tree has resinned naturally over years or decades in the forest, is considered by many in the trade to be the most prized and commands the steepest prices, though plantation-grown agarwood, produced through deliberate induction methods, has become an increasingly significant share of the legal global supply since 2017.

Conservation pressure has added another layer of complexity and cost. Because of high demand and a history of overharvesting, every species in the genera Aquilaria and Gyrinops was added to Appendix II of CITES, the international convention regulating trade in endangered species, at a 2004 meeting of the convention, with the listing taking effect in January 2005. Aquilaria malaccensis specifically had already been listed almost a decade earlier, in 1995. An Appendix II listing does not ban trade outright. It means that international shipments of agarwood and its products generally require proper export permits and documentation showing the material was sourced legally and sustainably. This adds cost and friction to legitimate trade, while also creating space for unregulated or mislabeled material to circulate, a problem covered in detail in our authenticity guide.

Agarwood's Place in Religious and Cultural Tradition

Long before agarwood became a global commodity, it held, and continues to hold, deep spiritual and ceremonial significance across multiple traditions, often independently of one another.

In Islamic tradition, oud is widely burned as incense and worn as oil, particularly across the Gulf region, where it is closely associated with hospitality, personal grooming, and religious occasions including Friday prayers and Eid celebrations. In Buddhist practice, agarwood incense has long been used in temple ceremonies and meditation, valued for a fragrance considered by many practitioners to support a calm and focused state of mind. Hindu tradition includes references to agarwood, sometimes under its Sanskrit-derived name agaru, in both ceremonial and Ayurvedic contexts. In China, chen xiang has a documented history stretching back well over a thousand years, used in temple incense, traditional medicine, and the literati incense culture that prized rare and complex fragrances as a marker of refinement.

Japan developed its own highly formalized incense ceremony, known as kodo, which had taken shape as a structured practice by the end of the sixteenth century. Rather than simply smelling the incense, practitioners describe the central activity as listening to the scent, a deliberate and contemplative process of distinguishing between different pieces of jinko, sometimes as part of a structured game in which guests try to identify or match the wood being burned. Like the more widely known tea ceremony that developed in the same period, kodo treats the appreciation of agarwood as a refined art with its own tools, etiquette, and trained practitioners, rather than as a casual pleasure.

These traditions developed largely independently, shaped by distinct theological and cultural contexts, yet they converge on similar associations: agarwood as something rare, sacred, or worthy of careful, ceremonial use rather than casual consumption. Each of these traditions is explored in far more depth in its own dedicated guide, since the history, theology, and practice involved are too rich to summarize fully here.

A Material Worth Understanding Before You Buy

Because genuine high-grade agarwood is rare and expensive, the market for it has long attracted misrepresentation, from synthetic scenting passed off as natural resin to wood from common origins mislabeled as something rarer. None of that is a reason to avoid the material. It is a reason to understand it properly first.

This guide is meant as a starting point. From here, our other hubs go deeper into where agarwood actually comes from and how regional origin affects character and price, how grading and authenticity testing actually work, how agarwood is used in practice once you own it, and what to know before you buy.