An even better method is to rent a lawn roller, a large cylinder that you fill with water and then push over the seedbed to firm it down. Water and, if needed, fertilize. Seeds require water to germinate. You should water during dry periods until the plants are about 1 to 2 inches tall. After that point, water only if plants look wilted or stressed.
Wildflowers normally grow well in average soil and don t require fertilizer.
If your wildflowers germinate well and grow thickly, they should choke out most weeds. When weeds do spring up in the midst of the wildflowers, pull them by hand before they have a chance to flower and disperse their seeds. This helps control unwanted weeds and grasses, and also helps disperse the mature seeds of your wildflowers. Wildflower seed mixes commonly include seeds of both annual and perennial plants. This is done so that the annuals will grow quickly and cover the ground, while the perennial plants are still getting established.