Cork Elm (Ulmus thomasii)

Common names:
Give a thumbs up Cork Elm
Give a thumbs up Rock Elm

General Plant Information (Edit)
Plant Habit: Tree
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Wet Mesic
Dry Mesic
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 7b
Plant Height: 50 to 80 feet
Plant Spread: 25 to 40 feet
Leaves: Deciduous
Flowers: Inconspicuous
Wildlife Attractant: Birds
Resistances: Drought tolerant
Pollinators: Wind
Miscellaneous: Tolerates poor soil
Conservation status: Endangered (EN)

Conservation status:
Conservation status: Endangered
the first mature tree

Photo gallery:

Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Dec 4, 2017 7:48 PM

The Rock or Cork Elm is similar to the American Elm but it is not vase-shaped, but upright in form. Its leaves are smaller of 2.5 to 4.5 inches long x 1.5 to 2.5 inches wide. It has corky wings on twigs and branches, at least somewhere. It grows in dry uplands and rocky slopes, but actually grows bigger in bottomlands. The wood is heavy and tough, thus the name of Rock Elm. Its native range is far southwest Quebec and southeast Ontario down into Tennessee out into east Nebraska up to central Minnesota over through most of Wisconsin and most of lower Michigan. It is definitely a good quality tree, I wish there were more, but is not common in most of its range. It has suffered loss from the Dutch Elm Disease also. So far, I've only seen it at Morton Arboretum in Lisle, IL.

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Discussion Threads about this plant
Thread Title Last Reply Replies
Slippery Elm (Ulmus rubra) by jimard8 Aug 16, 2015 2:38 PM 11
Tree id needed by threegardeners Jun 7, 2012 8:07 AM 28

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