Many people want to know how to make St. Augustine grass spread quickly. Much of that work of spreading will be achieved by the plant itself. St. Augustine grass naturally distributes itself using both stolons and rhizomes, so there are efforts to grow the area of distribution both in the soil and above ground.
While the grass can spread itself, you may be looking at significant bare patches that you want to immediately solve. If that is the case, it may be a good idea to use sod patches – which can be purchased or professionally installed.