I've seen butterflies using Impatiens. They are good for full shade.

Here in zone 7a, I do see the Sulphurs nectaring on my Impatiens quite a lot.

don't impatiens get quite leggy in the shade?

Suzy - no they don't. At least not the ones I've grown.

Frankie - I don't know if you're going to get much butterfly action in the shade. I think they stay in the sun because it gives them the energy to fly. However, I've seen some cool looking moths on my impatiens at night (seen by porch light).

Deanna