Your native grasses (little bluestem, switchgrass) are warm season grasses, and won't begin to grow until soil temperatures reach approximately 70 degrees. They also require a freeze/thaw cycle so if you planted this spring they probably won't begin growing until next year. It typically takes around 3-4 years for native grasses to become well established. It is difficult waiting to see if you have a good stand or not, but there is really no way to know in the first year. Native wildflowers can also be tough to get started. If you spray a broadleaf any wildflowers that have sprouted will die.
