Repeated seeding may be required to ensure a good grass cover. Check for and prevent damage to the dike by rodents and other burrowing animals. Manage vegetation in and around the lagoon. Healthy, vigorous perennial grass is the best type of vegetation with which to surround a lagoon. Maintain grass inside the fence to a height of no more than 6 inches.
Tall vegetation restricts air flow, reducing evaporation from the lagoon.
Cut to 3 inches often enough so no more than half the growth is removed at each mowing. Mow cool season grasses like fescue and bluegrass every two weeks in cool months, and monthly during hot weather. Maintain healthy perennial grass outside the dike. This grass should be vigorous and can be taller than grass inside the dike. Mow to stimulate a dense, healthy grass cover.