Water, water, water! How well your new grass will do depends upon how it is treated in the immediate days after installation. For about the first 3 days, keep the grass very damp to soaked – you can lift an edge of a slab and see for yourself how well it is watered. Within about 4 days, the root system will begin to attach, and it will feel and sound similar to Velcro when you lift an edge. At this time, you should be able to see tiny white roots growing from the sod to the ground. This means that the grass is doing well. It still needs to be watered regularly, but it has made it through that critical period when it really needs to be drenched.