Nutgrass is incredibly difficult to eradicate and can remain inactive in soil for long periods of time. It can be as simple as a disruption of soil or the addition of nutrients or water to an area that causes a dormant nut within the soil to begin to grow.
If you find Nutgrass in your lawn, it is best you act quickly before it spreads and becomes almost impossible to remove. The best way to remove it is by digging it out with a small spade. You have to be extremely diligent with this to ensure there is no roots or bulbs left in the soil as Nutgrass will reappear if left behind.
If there is a large amount of Nutgrass in your lawn, you will need to treat it with a selective herbicide such as Amgrow Sedgehammer or Sempra. Remember to always follow the manufacturer’s instructions on the pack. These chemicals are generally on the expensive side, however you only need a very small quantity to treat the affected area. Be aware that repeated applications may also be required. If you don’t treat these weeds, they will continue to multiply and infest your whole lawn, so it’s definitely worth doing in order to save your lawn from continued infestation.