Answer: There are two disease resistant American elms to look for are 'Valley Forge' and 'New Harmony'. They should be readily available in the fall and again in the spring. 'Valley Forge' grows 26 feet tall, with a 30 foot crown spread at 12 years old. 'New Harmony': 68 feet tall, 72 foot crown spread at maturity.
Once established, trees will grow as much as 3 feet per year. 'Valley Forge' has the classic American elm form: upright, arching, broadly vase-shaped with full, dense leaf canopy. 'New Harmony' has a broadly V-shaped crown with limbs terminating in numerous slender, often drooping, branches.
Whichever you choose, enjoy!
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