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joeschmoe80

DED resistant American Elms

12 years ago

I'm thinking of planting a couple of the DED-resistant American Elms. The "big three" are Princeton, New Harmony, and Valley Forge from what I've read. Here's what I *think* I know, but can any of you who have one give me a bit more info?

To me, the "Princeton" has by FAR the best youthful form, much fuller and lusher and not in need of much pruning. It's mature form is certainly vase shaped, but a bit "wider" and more spreading than the prototypical American Elm. Almost more "umbrella" than vase. If I recall correctly, the cultivar was selected for these reasons 90 years ago, before DED even existed in North America. I seem to remember reading it also resists Elm Yellows, which few U. americana cultivars can boast.

Valley Forge has the best DED resistance, but seems typically susceptible to Elm Yellows. It's much less attractive and disciplined in youth, but, if pruned correctly, seems to have the best mature form, more upright and "classic", but it doesn't get there on its own. Some people have said they actually have to stake the leader straight until about 15 feet or so, then you can limb it up and let it go.

New Harmony seems to be somewhat less DED resistant (not sure about Elm Yellows) but still sufficient for most uses. It needs less pruning than VF. I've seen the pics of the "original" New Harmony, and it looks nice enough, but other specimens I've seen seem to have TOO strong a central leader, making it not quite as likely to form the classic elm shape without some training. I remember hearing that the original New Harmony tree is in Ohio, but I don't know where.

What experiences have you had, and, is Elm Yellows a big problem in Central Ohio?

If Elm Yellows is a big issue, then which of the hybrids have the best "American-like" form that grow LARGE?

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