After your spring treatment:

This time of year we use a slow releasing Organic Based Fertilizer, granular or liquid, which contains a post-emergent weed control.

In the spring our weed control takes 10-14 days to be
fully effective.

Please wait 24 hours to mow after the application has
been applied.

Your lawn needs 1 inch of moisture per week. Infrequent, deep watering is the way to go.