What is the practice of seeding over established turfgrass called?

The practice of seeding over established turfgrass is known as overseeding. This technique involves spreading additional grass seed over an existing lawn to improve its density, color, and overall health without completely removing the existing turf. Overseeding is typically employed to introduce new grass varieties, improve resistance to pests and diseases, and enhance overall lawn quality, especially in areas where the grass has thinned or suffered due to environmental stressors.

By incorporating overseeding into lawn care practices, turf managers can rejuvenate the turf without disrupting the existing root system significantly, maintaining a healthy and green appearance. The germination of the new seeds is facilitated by the established grass, which provides shade and helps with moisture retention, creating a more favorable environment for young seedlings. This method contrasts with options like interseeding, which typically refers to the practice of planting different species or types of grass in between existing plants rather than simply supplementing the current grass.