It is not uncommon for existing wildflower meadows to become patchy over time as parts die back and fail to self-seed. If this happens, you may wish to sow grass or wildflower seed into the bare patches; this is a useful option if you are covering a large area of ground; pre-grown plug plants can be relatively expensive.
grass or wildflower seeds
Use a rotary mower to trim areas that you wish to reseed. Begin using the blades on a high setting, and then work down until the exposed sections of soil can be seen.
Use a landscape rake to roughly rake the soil until it is a fine tilth. Remove any perennial weeds that you come across, such as thistles and nettles, being careful to remove the whole root.
Measure it out and then distribute it over the bare patches. Gently rake it into the ground using a fine rake. Continue this process for other bare patches in the meadow.
Annual seeds flower after a few weeks; perennials, such as Verbena bonariensis, shown, may not flower in their first year. Cut the plants back once the flowers have died. Rake up the clippings to ensure the soil fertility stays low.