Lawn and Landscape Checklist - May Here are a few tips to help you keep your lawn beautiful in May. iStock/Thinkstock Mow the lawn in a different direction each time you mow. This prevents ruts from forming and leaves grass standing at a slightly different angle each time. Watch for broadleaf weeds like dandelions in the lawn. If they’re prominent and you still have not fertilized, act quickly. Apply GreenView Fairway Formula Spring Fertilizer with Weed and Feed & Crabgrass Preventer. iStock/Thinkstock Allow rain to water your lawn. Frequent light watering will not encourage deep roots and can result in weaker plants. Watering in the evening means grass plants remain wet overnight, which can encourage disease activity.