The US Department of Agriculture is a great place to start when learning about the native environment of America. Their extensive database provides an indexed and searchable catalog of native plants.

The CPC safeguards rare plants by advancing science-based conservation practices, connecting and empowering plant conservationists, and inspiring all to protect biodiversity for future generations. They have extensive online resources and communities, including a rare plant academy intended to train a new generation of plant conservationists.

NANPS is a charitable organization founded originally as the Canadian Wildflower Society, that is committed to preserving native plant habitat in wild areas and restoring indigenous flora to developed areas. They have a searchable native plant database available for the general public, along with many other online resources.

The Lady Bird Johnson Wildflower Center is a charitable organization based in Austin, Texas that uses native plants to restore and create sustainable, beautiful landscapes. They also provide a searchable native plant database.

The Forest Service, a department of the USDA, has robust online documentation answering questions about native plant materials and how to’s on native gardens.