There is a new program in the U.S. called Million Pollinator Gardens. The idea is to create one million garden habitats for butterflies, bees and any other insects which need flowers to pollinate.
Once you create your garden you can post that information online.
It’s interesting that the greater St. Louis area seems to be leading the way with 1450 gardens registered as of this posting.
You can register your pollinator garden at this site.
Please also don’t forget to add Host plants for all the butterflies.