The Pennsylvania Native Plant Society
The Pennsylvania Native Plant Society (PNPS) is a not-for-profit organization that helps people learn about and enjoy native plants found in Pennsylvania.

Pennsylvania Flora Project
a major focus of the Botany Department of the Morris Arboretum of the University of Pennsylvania

Lady Bird Johnson Wildflower Center
The purpose of the Lady Bird Johnson Wildflower Center is to educate people about the environmental necessity, economic value, and natural beauty of native plants.