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Broadleaf Weed Control

Source: NDSU Extension Service Horticulturists

To control broadleaf weeds such as dandelions, ground ivy and chick weed, you will have to use chemicals.

Weeds in lawns are usually not the cause but the result of poor grass growth. Weeds invade a lawn when the grasses are not growing vigorously enough to keep them out.

Your first step in weed control is to determine why your lawn grass is not doing well. Does it need fertilizer? Has the soil become compacted from heavy traffic? Have you been mowing too close? Correct whatever the problem is and provide the best growing conditions possible for the grass.

Even with a healthy lawn, the use of a broadleaf weed killer may be necessary. First, identify what weeds are present in your lawn. Then, buy a broadleaf weed killer that will control the weed or weeds. Apply early in May when weeds are growing rapidly. Another good time is in September after a good soaking rain. The temperatures should be in the 70 to 80 degree range for best results. Never use broadleaf weed killers in the heat of July and August.

Read the label and apply according to directions. Use no more, no less. The active ingredients in broadleaf weed killers include 2,4-D, Dicamba and MCPP. Always use the amine (salt, not ester) form of 2,4-D.

Remember that broadleaf weed killers are broadleaf plant killers. They do not differentiate between dandelions and tomatoes. Apply only to weeds in the lawn, not to the entire complex of plants found in your yard.

For more information, request circular H1009, "Weed Control in North Dakota Turfgrasses," from your county office of the NDSU Extension Service.

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