We'd like to mention a few species here that are favorite food plants for butterfly species.
Giant Swallowtail Larvae feed upon Prickly-ash(Zanthoxylum americanum) and Wafer-ash(Ptelea trifoliata)
Eastern Tiger Swallowtail Larvae feed upon Plum and Cherry (Prunus), Linden (Tilia) and Birch (Betula)
Striped Hairstreak Larvae favor Roses and Blueberries (Vaccinium)
Spring Azure Larvae feed upon Dogwood (Cornus). Spiraea and New Jersey-tea (Ceanothus)
American Snout Larvae favor Hackberry (Celtis)
Question Mark & Comma Larvae feed upon Elm (Ulmus), Hackberry (Celtis)
Common Tortoise Shell Larvae prefer Aspen, Cottonwood (Populus) and Willow (Salix)
Mourning Cloak Larvae feed upon Willow (Salix), Elm (Ulmus), Aspen (Populus) and Birch (Betula)
Red Spotted Purple and White Admiral Larvae prefer Oaks (Quercus), Plum and Cherry (Prunus) and Aspen (Populus)
Viceroy Larvae feed upon Willow (Salix) and Aspen (Populus)
Silver Spotted Skipper Larvae want Legumes, We grow a few; Indigobush Amorpha, Leadplant, Honeylocust, Wisteria