How to Eliminate Nutsedge From a Lawn

Nutsedge is one of those turfgrass weeds that can drive a homeowner nuts. It is also known as nutgrass or swampgrass, but no matter what you call it, it's a problem. It isn't a broadleaf weed so the late spring herbicides have little effect. However, you can take steps to control this perennial problem.

Difficulty: Moderate

Instructions

1. Identify nutsedge and determine whether it's yellow or purple. The weed is most active during the hot summer and reproduces by underground tubers called nutlets. Nutsedge is often easily visible above turfgrass. In spring and fall, it's difficult to identify since cooler temperatures slow its growth.

2. There are two types of nutsedge common to turfgrass: yellow nutsedge (Cyperus esculentus) and purple nutsedge (Cyperus rotundus). Yellow nutsedge has yellow flowers; purple nutsedge has purple. It is important to identify the type of nutsedge in your lawn since no one herbicide eliminates both. See the eHow article "How to Identify Nutsedge in a Lawn."

3. Pull the nutsedge from the turfgrass. If the nutsedge problem is minimal, simple hand weeding may be effective.

4. Choose an herbicide. Look for a product containing bentazon to combat yellow nutsedge, while imazaquin is effective on purple nutsedge. Some commercial nonselective weed and grass killers are also recommended for control. It's important to read the label of any pre- or post-immergant herbicide to determine if it is recommended for nutsedge.

5. Treat the area infested by nutsedge. As a general rule, do not apply when temperatures are over 85 degrees Fahrenheit. Follow the label instructions for the appropriate rate and manner of application.

6. Reapply herbicide. Nutsedge is stubborn and may require several applications to eliminate.

Tips & Warnings

• The best defense against nutsedge is a thick, healthy lawn.
• Nutsedge can also invade ornamental beds. To combat, keep a consistent layer of mulch 2- to 4-inches deep and weed often.