All weeds are not created equally, some are more destructive than others. But generally, all weeds have a negative impact on plant growth if left unmanaged. Not only do weeds look unsightly but they also deprive your plants of important nutrients and sunlight. Invasive weeds grow faster than most plants and quickly encroach and take up space. Lack of nutrients and weed encroachment makes your plant life more acceptable to insect infestation and disease.