You can use a weed and feed or a liquid spray like Weed Beater Ultra. You’ll need to wait a bit until nighttime temperatures are 45° or higher…usually mid May. Until then, just mow off the flowers so they don’t form seeds. Don’t mow for a couple of days before or after application and don’t water after or appy when rain is expected within 24 hours after application. The leaves absorbs the weed killer so the weed killer needs to stay on them as long as possible. Read and follow the directions on the packaging.