When it comes to Ironweed, there are lots of nectar and pollen rewards for visiting insects. The most common insect attendants are bees and butterflies. There are several notable species of bees you may find around your Ironweed such as solider bees (Chauliognathus spp.), bumble bees (Bombus spp.), and the green sweat bee (Agapostemon spp.).
Several species of butterflies like, monarch, hairstreak, skipper, and swallowtail are also common visitors. There are two species of long-horned bee, Melissodes denticulata and Melissodes vernoniae that are specialists of Ironweed. Specialist bees have specific relationships with only a few plant species. Some specialist bees forage for pollen that can only be found on a single plant species. The benefit to pollinators that Ironweed provides is infallible.
Ironweed is also a larval host plant for the parthenice tiger moth, American lady, and the crossline skipper.
Notably, the foliage of Ironweed is bitter tasting and is generally avoided by mammalian grazers.