The lawn mowing season is officially open. We know that from the hum of mowers in the neighborhood. • Sharp blades and fresh gasoline are a must for the first mow. Set the height to 3 inches, taller if the lawn is uneven. Aim for removing a third of the grass height with each mow. • With the first mow or two, use the bag attachment to pick up excess leaves and small sticks that have blown in over the winter.