East Indian Walnut

East Indian Walnut is a trade name for the timber of Albizia lebbeck, a fast-growing tropical tree in the legume family (Fabaceae) native to the Indian subcontinent, Myanmar and the Andaman Islands and now naturalized throughout the tropics. Despite the name it is not a true walnut (Juglans); the label comes from the way its darker, streaked heartwood can resemble walnut when finished. It is far better known across South Asia by regional names such as kokko, siris and lebbeck.

The tree is a broad-crowned, medium-to-large legume, valued as much for shade, fodder and nitrogen fixation as for timber, which is why it appears along roadsides and in plantations well beyond its native range. Its wood ranges from a pale, wide sapwood to a walnut-brown heartwood with darker markings. The sample shown here presents the lighter end of that range — a cream to pale tan surface with fine grain and moderate figure, typical of sapwood-rich or paler boards rather than the deeply colored heart.

The wood is strongly two-toned. The sapwood is wide and pale — creamy white to a light yellowish tan — while the mature heartwood is a walnut-brown, often with darker chocolate streaking that gives figured boards their appeal. The cream-to-pale-tan color observed on this sample reflects the lighter sapwood-side tones; heartwood-dominant stock is considerably darker. Grain is commonly interlocked, which produces a ribbon or stripe figure on quartered surfaces, though texture on paler, finer stock like this reads as moderately fine with an attractive natural luster.

It is a medium-density hardwood, averaging roughly 40 lb/ft³ (about 640 kg/m³) at 12% moisture, with a Janka hardness around 1,260 lbf — placing it in the medium-hard range, comparable to or a little below true black walnut and well above soft domestic species. The heartwood is rated durable to moderately durable, with good resistance to decay and reasonable termite resistance, while the pale sapwood is not durable and is prone to insect and fungal attack. It is dimensionally stable in service once properly seasoned.

East Indian Walnut is a general-purpose and decorative furniture wood. It is used for cabinetry, tables, chairs, paneling, interior joinery and turned work, and its figured heartwood is sliced for decorative veneer. In its native regions it also serves as a utility and construction timber for framing, agricultural implements, wheel and cart parts, and boat building.

The wood turns and carves well, making it popular for bowls, decorative objects and craft work, and the contrast between pale sapwood and dark heartwood is sometimes deliberately featured in live-edge and rustic furniture. Paler, fine-grained boards such as this sample suit lighter furniture, inlay and accent work where a clean cream-to-tan tone is wanted.

East Indian Walnut works fairly easily with both hand and machine tools for a tropical hardwood. The main caution is its interlocked grain, which can tear out during planing and molding — a reduced cutting angle and sharp tooling help produce a clean surface. It has only a moderate blunting effect on edges, holds nails and screws adequately, glues soundly, and takes stain, polish and clear finishes very well, buffing up to a good natural luster.

It seasons reasonably well but should be dried carefully to avoid distortion, and the durable heartwood is somewhat resistant to preservative treatment while the pale sapwood accepts it readily.

Toxicity note: like many Albizia legumes, the fine sawdust can irritate the eyes, skin and respiratory tract and has been reported to cause sensitization in some workers, so dust collection and a respirator are advisable. The wood carries no CITES listing and no endangered-species restrictions.

Supply is generally good and inexpensive within South and Southeast Asia, where the tree grows quickly and is widely planted; it is often marketed there simply as siris or kokko. In Western markets it is a minor specialty import, showing up as figured furniture stock, turning blanks and occasional veneer rather than as a mainstream commercial lumber, so pricing depends heavily on figure and availability rather than a fixed market rate.

Sustainability is not a concern: Albizia lebbeck is a fast-growing, widely naturalized — and in some regions invasive — species, and it is abundant and not threatened. It is not listed on any CITES appendix, and responsibly sourced or plantation-grown material is straightforward to obtain.