Farmers grow red clover (Trifolium pratense) as a cover crop, usually during the winter months. Its reddish pink blooms and leaves that are composed of three leaflets easily distinguish it from other clovers. For the average home gardener, red clover can be a weed that spreads in the lawn or garden. Fortunately, there are several methods for killing red clover weeds.
Pull up the red clover and toss it in the garbage, compost pile or local yard waste facility. This works well for small infestations and is easiest to do when the soil is just slightly wet.
Rototill the area after the red clover has begun blooming, usually in the spring or summer. This works well for patches that are densely covered in red clover.
Mow the clover in the late summer or early fall. Wait four weeks to apply an herbicide (e.g., one that contains glyphosate) that is labeled to kill red clover and is suitable for where your red clover is growing (e.g., your lawn). Follow the directions written on the label for application rate and method. Temperatures during the day should be above 60 degrees F when you apply the herbicide for this method to work.