Weeds can be indicators of other lawn problems 07-14-08

A weedy lawn is usually a sign that the lawn has other problems as well. Many of the weeds found in a lawn can often be used as indicators to identify these other lawn problems.

• Finding an abundance of legumes, such as clovers and lespedeza, may indicate a deficiency of nitrogen fertilization.
• Kyllinga and sedges are generally more prevalent where the soil is poorly drained.
• Algae is associated with areas that hold standing water.
• Goosegrass and path rush are often associated with compacted soils.
• Woodsorrel (oxalis) is found on low pH soils whereas plaintains may be found on high pH soils.
• Crabgrass and many other weeds appear when the turf canopy becomes thin and sparse from improper mowing, drought, insects, and diseases.

Take note of the weeds found in your lawn and examine the environment you find there. By making a few cultural changes such as adding fertilizer and lime, mowing more often at the proper height, or correcting some drainage issues may encourage a much healthier lawn and reduce your weed problems.

More specific information on chemically controlling weeds in home lawns can be found in extension publication #1532 Weed Control Guidelines for Mississippi.

Published July 14, 2008

Dr. Wayne Wells is an Extension Professor and Turfgrass Specialist. His mailing address is Department of Plant and Soil Sciences, Mail Stop 9555, Mississippi State, MS 39762. [email protected]