Tip for April thru August
Yellow Nutsedge and purple Nutsedge are the two most common sedge species.
Sedges are perennial grassy weeds that are common pests in turf, and they can be a serious challenge to control. When present, their long green leaves create an unattractive diversion from a consistent stand of turf. The yellow variety can be found in both warm and cool climates, and is generally easier to control than the purple variety. Purple Nutsedge is predominantly found in the South.
These perennial weeds can reproduce one of two ways: by seed and by underground tubers. Mature plants that have well-established tubers are highly difficult to control because of the durability of the structures. The leaves of treated Nutsedge often die above ground while the underground tubers remain live and produce new stems and leaves. And unless winters are harsh, the tubers can live over winter and return the following spring. Both sedges have a tendency to favor wet areas of the landscape, and sedge activity is made worse when there is excessive rainfall.
Yellow and purple Nutsedge are grassy weeds that cannot be control by a spring preemergence. Nutsedge seems to be getting worse every year. You must remember that post emergences are only contact killers there are no lasting effect. So when we spray an area or even the whole lawn you can get a new crop of Nutsedge in just a few days.