Seeding is an easy option birds and squirrels will appreciate. Laying sod is an option if instant grass is the only solution, but can be expensive. A third solution is hydroseeding.
Hydroseed is a mix of grass seeds, mulch, fertilizers, bonding agents and water. The mix is sprayed onto topsoil and transforms into a uniform lawn in a few weeks, depending on the season and climate where it is applied. Hydroseed typically germinates faster than seeds alone, because seeding requires several days of watering to reach the same level of moisture saturation the grass needs to grow. Not all types of grass can be grown with hydroseeding, but most common varieties—including Bermuda, Buffalo, Zoyzia, Fescue—can be hydroseeded.
In most areas, hydroseeding can be done in the spring, fall and early summer. Soil preparation is the same for all types of grass: remove all debris, till the soil adding necessary fertilizers for the site's condition, grade and level for smooth surface and then lightly pack and moisten the yard. After a lawn has been hydroseeded, water it lightly for three to four weeks, keeping the surface moist. In addition to preserving moisture, the mulch in the hydroseed mix will help prevent erosion and runoff. However, heavy rain or sloped areas can cause the seed, chemicals and silt to wash onto sidewalks and into sewer systems. In most cases the grass will be ready to mow in three to four weeks. Keep traffic low for two to four months after the lawn is established, and avoid normal to high use until the lawn has had a year to take root.