What type of BUTTERFLIES are you trying to attract?
Monarch and swallowtail mostly, any kind of native butterfly or moth or pollinator that might benefit.
What NECTAR and HOST plants are in your garden?
Native milkweed, dill, parsley as hosts. Joe pye, vervain, echinacea, mountain mint, rough blazing star, goldenrod, aster and many more for nectaring.