For Spicebush Swallowtails. Needs a moist spot. Y Passiflora spp. Might help lure a vagrant Gulf Fritillary or Zebra. Y Poaceae spp.
Many different species use various grasses as host plants.
Plant Delights has a great selection of these. Though most don't cause problems, you can't be sure which ones will before you try them - it's not worth the risk to plant any exotic ornamental grass. Also great for birds, as you can tell by all the seedlings that sprout in your yard. Every yard needs an oak tree. Host for White-M Hairstreak, Juvenal's Duskywing, and Horace's Duskywing.