Weeds are a small group of grass in the the Animal Crossing series that appears every day at 6 AM. They affect the town's condition, and contribute to the appearance of a raffelsia. They lower the chance of flowers breeding. They change color during the seasons.
All weeds in a town can be removed by pulling them up, which destroys them, or by talking to Wisp.
They will not appear as much if the Beautiful Town ordinance is enacted.