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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Rock elm is Ulmus thomasii Sarg., a North American hardwood also known as cork elm. Its strong, stiff, shock-resistant wood has been used for bent furniture parts, crates, containers and veneer bases; historically, old-growth timber was also used for ships. The name can refer to more than one elm in wood-trade contexts, so the botanical name matters when identifying a tree or buying lumber.
What is rock elm?
Rock elm is a medium-sized to large tree in the elm genus, identified botanically as Ulmus thomasii Sarg. The USDA Forest Service profile calls it “cork elm” because older branches can develop irregular, thick corky wings. Those wings are a useful clue, not a definitive identification on their own; the cited profile does not provide a complete leaf, bud, flower or fruit key.
Common names can be imprecise. The USDA Forest Products Laboratory lists “rock elm” among names associated with multiple elm species, while U. thomasii appears under names including Canadian rock elm, cliff elm and cork elm. Use Ulmus thomasii when species identity matters, particularly in a lumber specification or purchase.
Where does rock elm grow?
The species is most common in the Upper Mississippi Valley and around the lower Great Lakes, especially lower Michigan, Wisconsin and southern Ontario. Its native range extends from parts of New England and New York and extreme southern Quebec, west through Ontario, Michigan and northern Minnesota, and south to southeastern South Dakota, northeastern Kansas and northern Arkansas. It also reaches Tennessee, southwestern Virginia, southwestern Pennsylvania and northern New Jersey.
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Rock elm occurs in mixed hardwood forests, commonly on moist but well-drained sandy loam, loam or silt loam. It can also grow on rocky ridges, limestone outcrops and streambanks. The USDA Forest Service profile notes that deeper loamy soils produce the highest-quality sawtimber. Associated trees include white ash, black cherry, basswood, northern red oak, American elm, eastern hophornbeam and eastern hemlock.
How to recognize it—and what the evidence does not establish
Look for irregular corky wings on older branches as a possible clue to rock elm. Because this feature alone is not a full field identification, confirm the tree with a reliable regional key or expert if certainty is important. The available profile does not establish a detailed set of leaf, fruit, flower or bud characteristics for distinguishing it from other elms.
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- Beautiful Grain: Features stunning natural wood grain patterns that showcase the unique characteristics of each lumber species
- Perfectly Kiln Dried: Professionally kiln dried to ensure optimal moisture content and stability for woodworking projects
- Premium Wood Species Selection: The lumber species from left to right are Grey Elm, Quarter Sawn Sycamore, Coffeenut, Walnut
- Variety Pack Contents: Includes Grey Elm, Quarter Sawn Sycamore, Coffeenut, Walnut
- Precise Dimensions: Each piece measures 3/4 inch x 2 inches x 48 inches with a tolerance of plus or minus 1/16 inch, providing 8 pieces total
On favorable sites, the USDA Forest Service reports possible heights of 30 m (100 ft) and ages of up to 300 years. These are upper possibilities reported in its 1990 profile, not typical dimensions for every tree. The profile also describes seeds and buds as food for deer, rabbits, squirrels and birds, with chipmunks, ground squirrels and mice among the small mammals that eat the seeds; it gives no quantified wildlife measurements.
What is rock elm wood used for?
Rock elm wood is valued for strength, stiffness, hardness, shock resistance and bending qualities. The USDA Forest Service lists bent furniture parts, crates, containers and veneer bases among its uses. It also reports that much old-growth wood was exported for ship timbers, and says the species was drastically overcut in many localities. That historical account does not quantify harvest or establish present-day supply.
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- Beautiful Grain: Features stunning natural wood grain patterns that showcase the unique characteristics of each lumber species
- Perfectly Kiln Dried: Professionally kiln dried to ensure optimal moisture content and stability for woodworking projects
- Premium Wood Species Selection: The lumber species from left to right are Grey Elm, Quarter Sawn Sycamore, Coffeenut, Walnut
- Variety Pack Contents: Includes Grey Elm, Quarter Sawn Sycamore, Coffeenut, Walnut
- Precise Dimensions: Each piece measures 3/4 inch x 2 inches x 12 inches with a tolerance of plus or minus 1/16 inch, providing 8 pieces total
The USDA Forest Products Laboratory’s elm technical sheet reports dry specific gravity of 0.63 and dry hardness of 1,320 lbf for rock elm. These are reference figures from a species technical sheet, not a current lumber grade specification or a guarantee for an individual board. Actual lumber quality depends on the material being sold and its grading.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check when buying rock elm lumber
A listing that says only “rock elm” may not establish which elm species is being offered, because common names overlap. Ask the seller to verify that the wood is Ulmus thomasii and request relevant grading or product details for the intended construction or woodworking use. The cited sources document traditional uses and wood properties, but do not establish current retail stock, pricing or market availability.
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The USDA Forest Service’s species account is a foundational source for ecology and historical uses, published in 1990; it is not evidence of current conservation status, population trend or 2026 commercial supply.
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- The lumber species from left to right are Butternut, Coffee Nut, Grey Elm, Quarter Sawn Sycamore as pictured
Sources
- USDA Forest Service, “Rock Elm” in Silvics of North America (T. R. Crow, December 1, 1990)
- USDA Forest Products Laboratory, elm technical sheet
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