Yellow Nutsedge is a weed that can blend in with your lawn until it begins to show its flowers and take over plots of turf. This noxious weed tends to follow the timing of Crabgrass. emergence, but requires completely different control methods. The first step is to identify if you have Nutsedge or a different weed lurking in your grass.
It is almost amazing how common this weed is in lawns, yet how overlooked it can be. Nutsedge can blend well with preferable grasses because of its upright growth and tendency to only grow in clusters of 3. Nutsedge is a perennial weed, which means it regrows from roots yearly. Blades are much wider than regular grass and have a lighter color. When it flowers Nutsedge can be easily noticed by its yellow spikelets. Most products the control Crabgrass will be labeled for Nutsedge as well. The difference with this weed is that it enjoys wet, sandy soils. So while making cultural practice changes for Crabgrass and Goosegrass, be careful not to overshoot the other way.
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Just like with Crabgrass, Nutsedge is rarely controlled effectively without using pre-emergent control procedures. Prodiamine or Dimension products applied in early Spring are essential to prevent seed germination of Nutsedge in early Summer. Post-emergent control measures include the use of products containing Halosulforon, sprayed multiple times at 2-6 week intervals. Spraying established Nutsedge is effective in most conditions but will likely leave an area of bare turf that will need repair in Fall. It is for this reason pre-emergent measures stand to be the most effective way to control this weed.