Sweetgum

Overview

Sweetgum is a very fine-grained Southern hardwood sold two ways. The wide whitish sapwood is "sapgum", cheap and plain. The gray to reddish-brown heartwood is "redgum", sometimes streaked and figured, and has long been used as a lower-cost walnut look-alike. It machines easily but warps badly while drying, so buy well-dried, flat stock.

Pros

• Very fine, uniform texture with a good natural luster; Wood Database says it has been called "satin walnut".
• Generally easy to work. It turns, glues, stains and finishes well.
• Sapgum is widely available at low cost; redgum is mid-range for a domestic hardwood.
• Figured redgum with dark streaks and quartersawn ribbon-stripe boards are decorative.

Cons

• Wood Database says it is known to warp and distort badly during initial drying, and still moves appreciably in service. Shrinkage is 5.3% radial and 10.2% tangential.
• Interlocked grain can tear out when planing.
• Heartwood is moderately durable to non-durable, and the sapwood is perishable; susceptible to insect attack. Not for outdoors.
• Redgum is uncommon because only older, mature trees yield much heartwood.

Variants and subspecies

• Sapgum: the whitish to light pink or tan sapwood; low cost, widely available.
• Redgum: the gray to reddish-brown heartwood; scarcer and more expensive.
• Figured redgum: heartwood with darker black streaks.
• Quartersawn: ribbon-stripe appearance, more stable and costlier.
• Not to be confused with Australian eucalyptus species that are also called "red gum" (Wood Database).

Working and finishing

Generally easy. Use sharp cutters and light passes to reduce tear-out on interlocked grain. Buy kiln-dried lumber that has been properly flattened; distortion drops significantly after initial drying but does not vanish. Wood Database says it turns, glues, stains and finishes well, and responds moderately well to steam bending.

Staining and finishing colour

It stains and finishes well, and the fine, uniform grain takes a convincing dark walnut tone. Redgum heartwood and sapgum take colour differently, so sort boards before staining or use a toner. Clear finishes show the natural luster. Dark streaks in figured redgum remain visible under stain.

Sustainability and handling

Wood Database reports sweetgum is not listed in the CITES Appendices and is a species of least concern with the IUCN (checked 2026-09-30). Wood Database reports sweetgum has been reported to cause skin irritation, though severe reactions are uncommon. The US National Cancer Institute reports strong and consistent associations between wood-dust exposure and cancers of the nasal cavity and paranasal sinuses, so use dust extraction and a respirator. US-grown timber is covered by the Lacey Act.

Popular projects

Wood Database lists veneer, plywood, furniture (including speaker and acoustic cabinets), interior trim, boxes and crates, and turned objects. As a stained walnut substitute it suits cabinets and paneling; painted work suits sapgum.

Buying notes

Ask whether you are buying sapgum or redgum, and whether the boards are kiln-dried and flat. CAG Specialty Wood lists sweetgum at $5.00 (5/4) to $7.75 (8/4) a board foot; one dealer only, with 2024 metadata. Sweetgum is easier to find in the Southeast than in the Northwest, and figured redgum or quartersawn boards cost more. Check each board for twist and bow before you buy.