If you haven't seen a Zebra Swallowtail (pictured) you might want to plant a few Pawpaw trees.  These butterflies are stunning, and their caterpillars feed only on the leaves of the Pawpaw tree.  It's host to several other butterfly and moth species as well, and flies and beetles pollinate the flowers.
 
     Pawpaws also are sought after for their fruits.  These fruits are considered berries but look more like bananas.  They're the largest of the native fruits with soft, yellow flesh tasting a bit like a cross between a melon and banana.  
 
     Pawpaws grow as either a single- or multi-trunk small tree, and they have big leaves -- sometimes 12-inches long -- that makes them feel tropical.
 
     At least two Pawpaws (more is better), planted 8 to 15 feet apart, are needed for pollination.