After a long winter, lawns certainly need some TLC, which includes fertilizing, watering, and eventually cutting. It can be tough to figure out when exactly to do the first cutting, however, as you want to keep the yard looking healthy while avoiding over-cutting. Trimming the grass too much or too soon can be harmful, as it makes the grass less capable of responding to environmental stresses like a sudden dip in temperature or a prolonged period of minimal precipitation.
Since grass growth is affected by many factors, including temperature and climate, experts suggest abiding by a general rule of grass height before making the first cut, rather than cutting grass on a certain calendar date. This means that the ideal first trim can change from one year to the next. A general recommendation is to wait until the grass, regardless of species, is at least two inches high. Waiting until this time will make the grass less susceptible to injury and even disease. The grass should never be mowed to less than a third of its original length during a mowing, as cutting it too short can damage the roots and interrupt the grass's normal growth.
While the time of the first cutting can fluctuate due to external factors, there are some steps you can take to make your lawn grow and be ready for the first cutting. Fertilizing the lawn is one essential to creating healthy grass, and it can be accomplished in several ways. In most of the United States, the time between February and April is a critical window for lawn growth. During this early spring period, lawns will need the most amount of nutrients, as the grass has been dormant for many months during the cold winter. Putting fertilizer on the lawn during this window of time ensures that the grasses will develop a strong root base, which in turn means that the grasses are more likely to grow faster and ultimately be healthier.
Precipitation is another factor in deciding when it's time to make the season's first cut. While you might be inclined to set the hose loose on the lawn, particularly in the first stretch of sunny days following a snow melt or prolonged rain, experts suggest waiting until the grass starts to wilt a bit before adding more moisture. While it's not a good idea to let the lawn's grasses dry out completely, watering too soon can have an equally negative outcome, as you'll be inviting the development of disease and root rot. By waiting to water the lawn until the grass slightly wilts, you'll also be fortifying the grass for the summer months, which inevitably bring longer periods of hot and moisture-less days.
When deciding when to mow the lawn for the first time in the new year, a final key deciding factor is a condition called "Spring Deadspot." This condition is a fungal disease, and it's characterized by tan patches that develop in circles. The patches appear in infected lawns following the winter, and it can take up to two years for them to show up. To prevent this troublesome condition, be sure to keep your lawn properly hydrated in the fall, and lay down a fertilizer that has a low nitrogen content in late fall.