Plant in a bright corner of your yard. Plant in groups. Masses of color are better than individual plants. If you can avoid the temptation to weed, so much the better. Butterflies need water.
Flat rocks are good for sunning in the warm afternoons.
John K. Walters For More Information on Butterfly Gardening Butterflies of New Jersey by Michael Gochfeld and Joanna Burger 1997, Rutgers University Press Extensive chapter on butterfly gardening for New Jersey. Information on helpful species and how to propagate.