Helpful websites have been the Lady Bird Johnson Wildflower Center https://www.wildflower.org, the Native Plant Project https://nativeplantproject.com, the National Wildlife Federation www.nwf.org, and the North American Butterfly Association www.naba.org.
Well written by E. Cantu. I have seen this plant in her front yard and it is beautiful. Cantu has provided a yard of natural plants to our region in South Texas and been a source of information and guidance to those who care about natural regional plants.