Any unwanted plant or any plant in the wrong place is known as a weed. With as many as 150 seeds ready to germinate throughout the entire season for every square foot of soil, the potential for weeds is tremendous. In fact, in the top six inches of the topsoil, over 1,000 square feet, there may be as many as 3,000 viable weed seeds. These seeds remain viable for many years.
Weeds are opportunistic plants. They compete with preferred plants for space, water, nutrients and sunlight. Just a slight weakness in the turf can allow a weed seed to germinate and become established. Cultural practices that help maintain health and vigor of the grass should end concern for weeds.