Photo - thespruce.com Nothing signals springtime quite like the smell of fresh-cut grass wafting through the neighborhood. With warmer weather on the way, your annual lawn duties begin. Of those tasks, mowing at the right height can have a big impact on the overall health of your turf and future weed problems. The first mowing makes the lawn look spring-like and very attractive. Subsequent regular mowing hardens the grass for drought and heat stresses later. So, when the first clump of grass grows above the mowing height, mow — even if a lot of the yard doesn’t need to be mowed yet.