Be on the lookout for grubs in your lawn. If you discover a problem (10 or more grubs per sq. ft.) this can be treated with Bayer Complete Insect Killer to eradicate and prevent grubs for up to three months.
Your lawn is likely flowering at this time of year. It may look like weeds!
Time to apply a weed control to the lawn, if necessary, to kill actively growing weeds. Use Bonide Weed Beater Ultra or Trimec Speed.
Weed preventers applied in March will begin to lose effect soon. Apply Preen Crabgrass Preventer to keep weeds from creeping in during the summer.
If you are looking to give your lawn a final boost before the summer heat arrives, apply a light organic fertilizer such as Milorganite or Lawn Restore.