Petitgrain is an essential oil obtained through steam distillation of the leaves and green twigs of the bitter orange tree (Citrus aurantium ssp. amara). Unlike neroli oil, distilled from the blossoms of the same tree, or bitter orange oil, pressed from the fruit's rind, petitgrain comes exclusively from the green foliage. Its main production regions today are Paraguay and France.

The name derives from the French "petit grain" — "little grain" — referring to an older distillation method that used the tree's small, unripe fruits, before the current practice of distilling leaves and twigs instead took over. In the perfumery of the southern French town of Grasse, petitgrain has long been valued as a more economical alternative to precious neroli oil, with a related but distinct character of its own.

Burned as incense, petitgrain releases a green, woody-orange scent with a subtle, slightly bitter freshness — more restrained and less sweetly floral than neroli, but more grounding. It is valued for its balanced interplay of calm and clarity, and is used in modern aromatherapy for stress relief without a sedating effect.

Agarwood does not come from a specific tree species but from the genus Aquilaria, native to the rainforests of Southeast Asia. What makes it remarkable isn't the tree itself, but a mysterious defence process within its heartwood: when the tree is stressed by a particular mould, injury, or insect infestation, it responds by producing a dark, dense, resin-saturated wood — and it is precisely this transformed wood that becomes prized agarwood. Since the process can take decades and wild populations of many Aquilaria species are now endangered, naturally matured agarwood ranks among the rarest and most expensive natural materials in the world.

For millennia, agarwood has been burned in religious ceremonies across Buddhism, Hinduism, and Islam, believed to purify the air, calm the mind, and open a connection to the spiritual world. It has also long been closely tied to wealth and status — given as a treasured gift between rulers, central to courtly fragrance culture across the Middle East, and, to this day, the prized base note of "oud" perfumes.

Burned, agarwood releases an exceptionally layered aroma — deep, woody, and aged, with notes of honey, amber, and leather, and a faint, almost animalic undertone. It is typically burned as small wood chips on charcoal, its scent unfolding slowly and in shifting facets over time.