Plugs are a good way to install Bermudagrass, zoysiagrass, St. Augustinegrass, and other creeping grass species. (Plugs don't work as well for noncreepers.) Plugs are little plants with roots, leaves, and a core of soil around the roots. After you plant them and keep them well watered, they take root and eventually fill in. The main drawback is that weeds can become a problem before the grass has a chance to fill in. Nevertheless, many people plug their lawns and do so quite successfully. Many garden centers sell plugs by the flat. The difference with sod is that it comes in solid sheets or rolls, and you lay it down like carpet. It gives you a solid, weed-free turf immediately. Sod is more expensive than plugs, so your budget may determine which you use.