In some cases, existing grasslands can benefit from the addition or introduction of desired plants. This can be achieved in two ways: through interplanting (planting the actual plants) and overseeding (planting seed of desired plants into grassland). A common method of interplanting is to place potted plants or root stock of forbs in sparse areas of an existing prairie. Scattering seed of a desired plant, often a legume or forb, over a newly burned or disked stand of grasses is an example of overseeding. Overseeding and interplanting are usually best done in conjunction with burning and tilling to help temporarily reduce competition for the newly added plants. For seeding legumes like alfalfa and red clover into cool-season stands, tillage is preferred. Till strips in the existing grassland as recommended previously, and broadcast seed into the tilled strips. You can also seed into cool-season stands after burning if the burn is timed to slightly set the grass stand back and provide a head start to the newly seeded legumes.

Seeding or introducing plants into warm-season stands is best done after burning. Remember that burning doesn't kill existing prairie plants, it merely eliminates the tops; so be sure to not interplant into areas saturated with existing plants. If you have an existing stand of thick native warm-season grasses with few forbs, light tillage will not harm the overall grass stand and will be necessary to successfully introduce prairie forbs.