When to plant wildflowers? Native seeds can be successfully planted in fall and winter.

Late summer, fall, and winter is when most native species of wildflowers and grasses mature and make their way into the soil. If you have prepared soil ready to go for fall or winter planting, you are simply imitating nature.
How to Turn Your Backyard into a Private Wildlife Sanctuary

Check out this article about creating your own wildlife sanctuary in your backyard. It discusses the benefits of attracting wildlife such as bees, hummingbirds, butterflies, and other insects, birds, and mammals. Joepye Weed, Hardy Begonia, American Beautyberry