September Elm

Scientific name: Ulmus serotina

Overview

September Elm is a comparatively uncommon native elm most associated with Tennessee, Arkansas, and neighboring parts of the east-central United States. Its autumn flowering distinguishes it from the spring-flowering habit of many familiar elms. In the timber trade it is generally combined with other hard elms rather than kept as a distinct lumber species.

This profile keeps that commercial grouping separate from species-specific measurements. Figures published for mixed rock elm lumber cannot automatically be assigned to a confirmed September Elm sample. For a woodworker, a trial piece and the behavior of the actual boards are more useful than a borrowed hardness or weight value.

Quick Facts

  • Common Name: September Elm
  • Alternate Common Names: Red elm (a name also used for other elms)
  • Scientific Name: Ulmus serotina
  • Region: North American Woods — scattered populations in the east-central and southeastern United States, especially Tennessee and Arkansas
  • Family: Ulmaceae
  • Tree Size: A medium-sized tree that may reach about 82 ft (25 m) tall and 2–3 ft (0.6–0.9 m) in trunk diameter
  • Average Dried Weight: A separate, dependable species-specific dried-weight average was not established; commercial hard-elm figures should be treated as group data
  • Janka Hardness: A verified species-specific Janka value was not established; do not substitute another hard elm’s rating
  • Color: Reddish-brown heartwood, with lighter sapwood
  • Grain: Often interlocked; evaluate the individual board
  • Texture: Elm-like texture with visible growth rings

Identification Characteristics

The wood is described as reddish brown and strong, and it falls within the commercial hard elm grouping. Examine a prepared end-grain surface for elm pore patterns, but regard this as evidence for a wood group rather than a complete species identification.

For this less familiar elm, a tree record is particularly valuable. Document leaves, twigs, fruit, flowering season, and the collection locality. Autumn flowers and fruit are useful clues, although Cedar Elm also flowers in autumn, so season alone does not separate the two.

Key identification traits include:

  • Elm growth-ring and pore patterns visible on a prepared cross section
  • Reddish-brown wood with paler outer sapwood
  • Often confused with other elms in mixed lumber
  • Autumn flowering useful as supporting tree evidence
  • A documented source is essential for a reference specimen

Working Properties

Start with small trial cuts when using a newly obtained board. Changing fiber direction can leave torn patches, so check the grain on all faces before choosing a cutting direction. A sharp scraper or a light abrasive pass may improve a difficult surface without removing excessive thickness.

Bring the wood to the intended indoor moisture condition and leave allowance during rough sizing. Recheck flatness before final joinery, especially in wide or resawn stock. Keep panels free to move across the grain, and test glue and finish on offcuts from the same material.

  • Use sharp tools and light final cuts
  • Compare machining results on radial and tangential faces
  • Check moisture and distortion before final dimensioning
  • Test bent parts before making matching finished components
  • Trial the complete finish on a representative offcut

Safety Note

Elm dust can irritate the eyes, skin, and respiratory tract, and sensitization has been reported. Use effective dust extraction, eye protection, and suitable respiratory protection during machining and sanding. Inspect salvaged stock for embedded metal and unsound wood before cutting.

Common Uses

September Elm has been sold with other hard elms for general woodworking. A well-documented, sound piece can be considered for furniture parts, veneer, decorative panels, or small projects according to its dimensions and grain. It is not usually a dependable source of large, matching retail lumber packs.

Historic use of mixed elm does not establish a modern structural design value for this species. For load-bearing work, use a properly specified product. For ordinary projects, assess cracks, grain deviation, and soundness directly and keep untreated material protected from persistent dampness.

  • Selected furniture and interior components
  • Decorative veneer from suitable logs
  • Small boxes and specialty woodworking
  • Trial bentwood components
  • Reference specimens and educational comparison sets

Sustainability & Notes

September Elm occurs as scattered trees and is susceptible to Dutch elm disease. Scarce retail availability should not be confused with a formal conservation assessment, and a useful wood sample need not come from harvesting a healthy tree.

Prefer documented existing lumber, suitable storm salvage, or material from necessary tree removals. Follow local handling and transport guidance for elm, and retain uncertainty on the label when the tree identification was incomplete.

Comparative Notes & Related Species

Related Guides

Compare Wood Properties

See how this species ranks in density and hardness using our Wood Density & Janka Hardness Chart. You can also explore Hardest Woods, Softest Woods, and Most Dense Woods for quick comparisons.

Collector Notes

This is a particularly useful species for a collection with a Tennessee or wider regional focus. Record the exact locality, source tree, identification method, and collection date; photographs taken while leaves or fruit are present can greatly improve the record.

Keep a measured, unfinished specimen rather than using appearance alone to compare it with Rock Elm or Cedar Elm. If density is measured from a sample, record moisture content and method, and label the result as a specimen measurement rather than a species average.

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Wood Sample Collection

This species is part of an ongoing effort to document and preserve wood samples from around the world.

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Resources

Authoritative botanical and forestry references used in compiling information about this species include:

• USDA Forest Service – Wood Handbook: Wood as an Engineering Material
https://www.fpl.fs.usda.gov/products/publications/

• The Wood Database – Global reference for wood identification, physical properties, and woodworking characteristics
https://www.wood-database.com/

• Royal Botanic Gardens, Kew – Plants of the World Online – Botanical taxonomy and species distribution database
https://powo.science.kew.org/

• International Union for Conservation of Nature (IUCN Red List) – Global conservation status assessments
https://www.iucnredlist.org/

• Convention on International Trade in Endangered Species (CITES) – International trade regulations for protected plant species
https://cites.org/

Additional forestry publications, academic research papers, and regional timber studies may also be referenced where available.

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Availability & Where to Buy

Exotic hardwood availability can vary significantly depending on region, sustainability regulations, and supplier inventory.

As this archive grows, recommended suppliers and specialty wood retailers will be listed here to help woodworkers locate responsibly sourced material.

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