Norway and Silver Maple Ohio Buckeye and Horsechestnut River Birch Hawthorn White, Black and Green Ash Common Honeylocust Kentucky Coffeetree European Larch and Tamarack Apples and Crabapples Aspen and Cottonwood Bur Oak and Eastern Pin Oak Swamp White Oak Willow Lindens Elms
You did not mention the tree(s) location, sun, shade, etc, so here are a few ideas based on your Zone 6, and clay soil...near a street or heavily traveled zone with cars: Trident Maple, Dawn Redwood, Nootka Cypress; in the shade: White Oak, Red Oak, Sargent Cherry; Evergreens: Spruce, Sweet Bay Magnolia, White Pine; Flowering Tres: Bradford Pear, Flowering Cherry. For the clay soil, make sure you are raising the bed on which the tree lies for good drainage.
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