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Larry,
I have Tilia cordata 'Swedish Upright' here in SW
WI--they are plants grafted from the Arnold Arboretum's plant which was wild
collected in south central Sweden. I have a dozen trees and the nearest
wild Tilia americana would be at least a couple miles away and probably beyond
bee range. There may be a yard tree I don't know about somewhere
closer but my nearest neighbor is a quarter mile away, the second, a half.
I expect them to be as pure as you'll find outside Europe. I can look for
seeds or send you scionwood if you like. I don't get volunteer
seedlings (hooray) so I can't tell you if the tree is self fertile.
You'll have to research that on your own. I've never tried planting
them. I find the scent of the tree somewhat disappointing compared to
other littleleaf clones out there. I planted them for scent and bee
forage, but chose the 'Swedish Upright' to assure hardiness in my cold climate.
So far they are.
Steve Herje
SW Wisconsin USA USDA zone 3-4
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