Laos and the Siam Benzoin Trade: From Upland Rice Fallows to Grasse

Siam benzoin is one of perfumery’s more misleading names. The resin it describes has never come from Thailand in any commercial quantity. It comes from Laos, and in smaller measure from the hill country of northern Vietnam, tapped from a tree that owes its livelihood not to plantation agriculture but to the rhythm of upland rice farming.

A resin named after someone else’s port

For centuries, resin gathered in the mountains of what is now Laos moved south and west along river and caravan routes into Siamese territory before being sold onward to Chinese, Indian and eventually European merchants. Bangkok functioned as the entrepôt, not the source. European buyers, working from what arrived at the docks rather than what they saw in the forest, recorded the material as Siam benzoin, and the label stuck through French colonial administration and into the modern trade. The Siam benzoin entry in this atlas reflects that inherited geography of commerce rather than botany.

A pioneer tree of the upland fallow

Styrax tonkinensis is not cultivated the way rubber or coffee is cultivated. It is a fast-growing pioneer species that seeds itself readily into cleared, sun-exposed ground, which makes it a natural companion to swidden, or shifting, rice agriculture. In the highlands of Laos, particularly Houaphan and Xieng Khouang provinces, farming households clear a hillside plot for upland rice, cultivate it for a season or two, and then let it lie fallow. Styrax tonkinensis seedlings colonize that fallow almost immediately, growing quickly among the returning secondary forest.

This is why the resin trade in Laos has always been described as gathering rather than farming. No one plants an orchard of Styrax tonkinensis in rows; households manage a patchwork of fallow plots at different stages of regrowth, tapping trees that are, in effect, a byproduct of the rice cycle rather than a dedicated crop.

Tapping in Houaphan and Xieng Khouang

Trees are left to grow for roughly six to eight years before tapping begins, long enough to reach a trunk diameter that can sustain repeated wounding. Tappers, historically Hmong, Khmu and Tai Dam households working these uplands, cut shallow incisions through the bark. The tree responds by exuding a pale, aromatic oleoresin that hardens on contact with air. The general method, wounding the bark and collecting the hardened exudate months later, is shared with the tapping of Sumatra benzoin described in how benzoin is harvested, though the tools, timing and forest context in Laos differ from those used on Styrax benzoin in Sumatra.

A single tree can be tapped for several seasons before yields decline and the tree is left standing or eventually cleared with the next rice cycle. Collection typically follows the dry season, when hardened resin is easiest to detach from the bark without contaminating it with wood or moisture.

Grades that moved through the trade

What reached export markets was never a single uniform product. Buyers in Bangkok, and later in Hanoi and Marseille, sorted incoming resin into recognizable grades that tracked purity and the amount of handling the material had received.

This grading logic is discussed in more detail in benzoin grades explained, and it shaped pricing at every stage of the journey from Laotian hillside to French perfume house.

From village basket to Grasse vat

Once collected, resin passed through a chain of intermediaries: village collectors, district traders, and wholesalers in regional towns who consolidated small lots into shippable quantities. Under French colonial administration in Indochina, this trade was drawn more tightly into formal channels, with resin routed through Hanoi and the port of Haiphong as an alternative to the older path through Bangkok. From either port, sacks of benzoin travelled by sea to Marseille, the standard gateway for raw materials destined for the perfume houses of Grasse.

Grasse manufacturers processed the raw resin into tinctures, resinoids and absolutes, dissolving the brittle lumps in solvent to extract the fragrant fraction and leaving behind insoluble bark and grit. It was this refined material, not the raw almonds, that entered fine fragrance compositions.

Why Grasse valued this particular resin

Chemically, Siam benzoin is distinct from its better-known counterpart, Sumatra benzoin, tapped from Styrax benzoin and related species on Sumatra. Siam benzoin is rich in benzoic acid esters, including coniferyl benzoate, and largely lacks the cinnamic acid derivatives that give Sumatra benzoin its sharper, more cinnamon-adjacent edge. A small but consistent fraction of vanillin contributes the soft, sweet, almost creamy quality that perfumers associate specifically with the Laotian material. The comparison between the two origins, chemistry and scent alike, is set out fully in Siam vs Sumatra benzoin.

That gentler, more vanillic profile suited the ambery and oriental accords being developed in Grasse through the nineteenth and twentieth centuries, where benzoin served as a fixative that rounded off sharper top notes without competing with them.

Laos benzoin today

The underlying system has changed only incrementally. Tapping is still carried out largely by smallholder households working fallow land tied to upland rice cultivation, rather than by any large-scale plantation operator. Export volumes have fluctuated with demand, infrastructure and, at times, the broader political disruptions that affected highland Laos through the twentieth century, but the basic link between rice fallow, pioneer tree and resin collector has persisted. It remains one of the few aromatic resins in global trade still gathered this way, as an incidental yield of a much older agricultural cycle rather than a crop grown for its own sake.

• laos
• siam-benzoin
• styrax-tonkinensis
• trade-history