If you want to attract butterflies to your garden, you need to know which butterflies are local and what plants they like. Even more important, what do their caterpillars like to eat? Butterfly caterpillars or cats can be found nibbling on the leaves of Asters, Anise, Carrots, Dill, Fennel, Milkweed, Parsley, Parsnips, Snapdragons, Sunflowers, and Violets.
Thats okay, as they wont cause any significant damage.
In my Northeast Pennsylvania garden, these are the butterflies I would expect to see Brush-footed, Swallowtails, Gossamer winged, Metalmarks, Whites and Sulfurs and Skippers. Find what's common to your area here.
To attract these butterflies:

|
Plant |
Perennial |
Flower color |
Bloom |
Height |
Sunlight |
Note |
|
Aster |
Perennial |
Blue, white, pink, purple |
Late summer to fall |
Dwarf: 12-18 Regular: 18-24 |
Dwarf: Partial Shade Regular: Full Sun |
Deer resistant |
|
Bee Balm |
Perennial |
Pink, purple |
Summer to Fall |
36-48 |
Full Sun and Partial Shade |
Edible |
|
Black-eyed Susan |
Perennial |
yellow |
Mid-summer to Fall |
18-30 |
Full Sun and Partial Shade |
Deer resistant
|
|
Butterfly bush |
Perennial |
Dark purple |
Mid-late summer |
6-10 |
Full Sun |
Deer resistant Shrub |
|
Butterfly weed |
Perennial |
Orange, yellow |
Late Spring-Midsummer |
18-24 |
Full Sun and Partial Shade |
|
|
Coreopsis |
Perennial |
Yellow, pink, red |
Summer-fall |
10-24 |
Full Sun and Partial Shade |
Some varieties are Deer Resistant |
|
Lilac |
Perennial |
purple |
Early Spring |
Most 4-8 up to 30 |
Full Sun |
Shrub |
|
Marjoram, Wild and Sweet |
Wild-Perennial Sweet-Annual |
Pink- purple |
Midsummer to Fall |
Wild 18-40 Sweet 4-6 |
Full Sun |
Can be invasive, Edible |
|
Marigolds |
Annual |
Yellow, orange |
Midsummer to Fall |
Most var. 8-12 |
Full sun |
Attract Japanese beetles, repels rabbits |
|
Phlox |
Perennial |
Pink, purple, white |
Early summer to Fall |
24-40 |
Partial Shade |
Deer resistant |
|
Purple Coneflower |
Perennial |
Purple |
Mid-late summer |
2-4 |
Full Sun to Partial Shade |
Deer resistant |
|
Sage |
Perennial |
Violet-blue |
Mid-summer to Fall |
2-4 |
Partial Shade |
Deer resistant Edible |
|
Zinnia |
Annual |
Multiple colors |
Mid-summer to Fall |
To 40 |
Full sun |
Good in pots and for cutting |