Our guarantee is that for a full season, (up to 1 year after time of delivery) if the Sod is installed within 24 hours of being delivered, the sod will grow. Because we know there may be glitches that are a normal part of new Sod, we are more than willing to work with you to make sure you have a successful transplantation experience. The guarantee is only valid if you do your part of assuring proper watering, fertilizing, weed control, and mowing. 90% of all problems with unsatisfactory conditions in any lawn, new or old are caused by improper watering. Proper watering includes even coverage of sprinkler system with the correct duration of sprinkling times. Too much water, too little water, or uneven coverage may cause problems that RWB Sod is not liable for. After sod is installed, you are responsible to keep it alive through proper care and maintenance.