Tubers develop rapidly six to eight weeks after the plants emerge usually during late July and August. Nutlets may get to be almost an inch in diameter. Unfortunately the nutlets may persist in the soil for many years. Yellow nutsedge is often an indicator of poor drainage. It particularly likes wet or moist sites or sites heavily irrigated.
Yellow nutsedge is difficult to control especially once it has formed tubers.
If you want to control it, don't wait. Once it has formed tubers, pulling it out will only remove the original plant. To control nutsedge without chemicals, maintain a thick stand of lawn grass through proper maintenance. A maintenance schedule is available through the U of I Extension offices . Pull nutsedge plants soon after emergence before nutlets can form.