80-120+ days to maturity. Southwest Wildflower Mix Seeds. Non-GMO, perennial. The American Southwest is a diverse and hardy place, and so are the breathtaking wildflowers that have adapted to live there. Many of these flowers sleep all winter to burst into color when the first raindrops come. Plant your little piece of the Southwest with this hardy, easy-to-grow mix. These flowers will feel right at home in Arizona, Southern California, New Mexico, Southern Nevada, Oklahoma, and Western Texas.