Pawpaw, grown for its tropical looking foliage, large flowers, edible tasty fruits and most of all to attract Zebra Swallowtail butterflies. These amazingly long tailed butterflies eat nothing else as larvae. If they don't find you, go out and net a few females, bring them home and release them. They are seldom virgins when you catch them and will usually start a colony as long as sufficient food is available and you introduce a bit of genetic diversity. Releasing a single female is not likely to be successful. Don't panic unduly about upsetting ecosystems, butterflies are often blown hundreds of miles outside their natural range, netting a few and moving them changes little.