It is always best to source plants and seeds from as near to your growing region as possible. Local ecotypes are understood to always perform better as they are specifically adapted to our area.
LOCAL NATIVE PLANT SOURCES
Delta Flora Native Plants
Pelican Greenhouse
NOLA Bug Lady
Rose Garden Center
OTHER:
MAIL ORDER NATIVES - https://www.mailordernatives.com
NATIVE SEED SOURCES
Coastal Prairie Farms, ULL Ecology Center
Ernst Seeds
Florida Wildflower Cooperative
Louisiana Native Seed
Mossy Oak Native Nurseries
Native American Seed
Prairie Moon Nursery
Roundstone Native Seed
Select Seeds
Swallowtail Garden Seeds
Turner Seed
Wildseed Farms
NATIVE PLANT DATABASES & INFO
BONAP (The Biota of North America Program): http://www.bonap.org, search any plant genus to see native range
USDA Plants Database: https://plants.sc.egov.usda.gov/java/
Louisiana Native Plant Society: Databases, links and more https://www.lnps.org/references