I’ve had success in attracting the Pipevine swallowtail in Western Iowa by planting Virginia snakeroot, which is a smallish non-invasive woodland native (shade-loving). It is not a plant normally offered by nurseries, but I will have plants available as rootstock this fall (2007) for those butterfly enthusiasts who wish to attract PVS to their gardens.
my butterfly collection 
I’ve had success in attracting the Pipevine swallowtail in Western Iowa by planting Virginia snakeroot, which is a smallish non-invasive woodland native (shade-loving). It is not a plant normally offered by nurseries, but I will have plants available as rootstock this fall (2007) for those butterfly enthusiasts who wish to attract PVS to their gardens.