Knightia excelsa

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Common products:
Rewarewa (Knightia excelsa) is primarily known as a structural and decorative hardwood timber used for construction framing, beams, flooring, joinery, furniture, and turned objects.

Industrial and craft applications:
The timber is processed for both sawn and engineered lumber, and can be sliced or rotary-cut into veneer for cabinetry and paneling. Its grain is interlocked, producing strong, distinctive figure that is valued in fine carpentry and specialty craft work.

Food and beverages (non-medicinal):
No documented edible or beverage uses are reported.

Colorants and tanning:
No documented use as a natural dye or tanning agent is reported.

Wood and fiber:
The heartwood is reddish-brown to dark brown; sapwood is pale. The species produces a general-purpose hardwood suited to both structural and finishing roles. Typical reported mechanical properties for the species include Janka hardness of approximately 10.7 kN and an air-dry density around 780–820 kg/m³; equilibrium moisture content at 12% MC is about 12%.

Fragrance and cosmetics:
No fragrance or cosmetic uses are documented.

Properties relevant to use:
High density and hardness, with interlocked grain that yields attractive figure; durability is suitable for interior structural applications and a wide range of finishing work. As with many New Zealand hardwoods, machining and finishing are feasible with standard practices.

Standards and regulation:
New Zealand structural timber is governed by NZS 3602 (Timber and wood-based products for use in building) for grading and acceptable species uses; exported timber may be specified under relevant national or international grading rules. Wood treatment and preservative use for insect resistance are addressed in NZS 3640 (Chemical preservation of timber).

Sustainability and sourcing:
Rewarewa is native to New Zealand and is managed under the national forestry framework. Timber is available through native and plantation-grown sources; national species management and FSC-certified supply chains support responsible harvesting.

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