These are plant nurseries, garden centers, plant shops, and plant retailers where you can find North Creek Nurseries plants available in your state or by mail-order/online ordering. Retail sources are listed alphabetically by state initial.
American Beauties Native Plants® is a groundbreaking program that offers proven solutions for garden centers, landscapers and home gardeners. Garden centers use our point-of-purchase materials to build displays that help direct their customers and educate their staff at the same time. Landscapers use our plants and fact-filled tags to enhance customer experience. They even create Certified Wildlife Habitats® for their clients, now that’s added value. Home gardeners love our branded pots because it takes the guesswork out of shopping. Our native plant experts have teamed up with wildlife experts to bring you collections that are guaranteed to bring life to your garden. Bird Garden, Butterfly Garden, Dry Shade and Moist Sun garden guides are available at www.abnativeplants.com.
https://www.chicagobotanic.org/downloads/planteval_notes/no37_joepyeweed.pdf
The Evaluation Study: The Chicago Botanic Garden (USDA Hardiness Zone 5b, American Horticultural Society Plant Heat-Zone 5) evaluated 26 taxa of Eutrochium spp. and related genera from 2001 through 2013. The study included Eutrochium spp., Ageratina spp., and Conoclinium coelestinum, which were all formerly classified as Eupatorium spp. (see Table 1), and several species of Eupatorium. The goal of the comparative trial was to identify outstanding Joe-Pye weeds [...]
https://www.plantconservationalliance.org/
A good resource, not only for conservation of species, but for native plant links and events.