Sodding versus Seeding
Sodding can have a higher initial cost than seeding, and there are fewer available grass types than you can find in seed form. Sod is usually also limited to grasses best suited for sunny locations. Sod can be laid anytime that the soil can be prepared, it is quickly established and it has more dependable results than seeding which often makes it cost less than seeding in the long run.
Successful, weed-free establishment is more difficult with seed than with sod. Also, because of the time required for germination and root growth of seed, the area is exposed to erosion. Sodding practically eliminates such problems, an especially important factor on steep slopes.
