Weeds can indeed hurt grass in several ways. They steal beneficial nutrients from soil, crowd neighbouring grass and plant life out and deplete plants by direct parasitic attachment. These factors lead to weakening, starvation, disease and the eventual death of grass.
Weeds pose a threat to lawn health and vitality because of their fast growth rates and robust nature. These factors contribute to issues such as fast sprouting weeds blocking sunlight from nearby grass and absorbing large quantities of limited water supplies, which prevent proper nutrient absorption by other plants and slows the development of grass coverage.
The rapid growth and development process of typical weeds causes overpopulation of the unwanted plant. If left unattended, therefore, many types of weeds eventually crowd out and kill grass in the immediate vicinity. Certain types of weeds even release toxins into the soil that prevent other forms of plant life from developing properly, ensuring their preservation and continued survival.
Weeds quickly take over a lawn and garden if they are not removed at an early stage and on a regular basis. Weeds are extremely difficult to get rid of once they take hold, so prevention and regular maintenance are key, and both physical and chemical methods of removal may be required.