Butterfly weed is an excellent flower the attract buttterflies to your yard. Plus it's a native flower in many states.
Asclepias tuberosa (Butterflyweed) | Native Plants of North America
Butterflies love Zinnia's. I plant these every summer. I always have many different varsities of butterflies visit them. They're very easy to care for and grow in many different soils. I have very rocky/clay soil and have no issues growing them.
Zinnias: How to Plant, Grow, and Care for Zinnia Flowers
Jenna Phlox is definitely a butterfly magnet. It's also a native plant which is improant for our ecosystem.
Phlox paniculata 'Jeana' - High Country Gardens
Beautiful and so easy to grow! Very low maintenance. Attracts butterflies. Native in many states!
Echinacea purpurea (Eastern purple coneflower) | Native Plants of ...
So easy to grow and take care of. Puts on an excellent show summer-fall. Native to many states!
Black-eyed Susan Flowers: Planting, Growing, and Caring for Black ...
Excellent for attracting butterflies! Easy, low maintenance, many varieties and puts on a show. Native to many states!
How to Grow and Care for Joe Pye Weed - The Spruce