Avoid excessive fertilization which can stress the grass during droughts and lead to pollution from runoff. Healthy turf competes with weeds for water and nutrients. The height allows the turf to shade out weed seedlings. Weeds can be pulled manually at any time. Remove as much of the weed as possible, including roots.
Smaller weeds are easier to kill than larger ones.
Follow directions on the manufacturer's label when using herbicides. Overuse of herbicides to kill weeds in lawns can also damage trees and shrubs. There will always be weeds. Low levels of weeds need to be tolerated. Copyright 1997, Division of Forestry.