When planting native grass and wildflower seed, we recommend sowing on bare, weed-free ground following extensive site preparation to reduce as much dormant weed seed as possible.
Summer soil solarization, using clear UV-stabilized plastic has consistently been the most successful site preparation method we have tested. For more information on this process, check out the excellent Xerces Society publication, Establishing Wildflower Meadows from Seed.
When planting, we recommend you hand scatter seed directly onto the soil surface, shaking the seed mix periodically during sowing to ensure the seed remains evenly distributed in the mix. Do not bury the seed or cover it with soil.