I found "Free Plants By Mail" on Twitter and thought it was well worth sharing with my butterfly gardening friends. 

Free Plants by Mail was started by local growers to help find a solution to the plants that were grown for nurseries but never purchased. Their collection of farmers grow hundreds of thousands of plants each month and there are always seasonal extras that would otherwise go to waste. 
Each month Free Plants By Mail will try to release a new plant that they will send out for free!  All they ask for is ask is that you pay a small shipping and handling charge.

They donated to The Nature Conservancy, a leading conservation organization that has been working to preserve our planet and its wilderness places.  Their mission statement is  “to preserve the plants, animals and natural communities that represent the diversity of life on Earth by protecting the lands and waters they need to survive.”

I think it's a great way for us gardeners to share, experiment and explore new plants for our butterfly gardens.

You can visit their website at www.freeplantsbymail.org and let me know what you think.