Healthy lawns resist pests, disease and weeds. Contrary to popular belief, pesticides do not create a healthy lawn. Use of chemical fertilizers and pesticides (which include herbicides, insecticides and fungicides) reduce soil fertility and beneficial microorganisms. A “chemically dependent” lawn is more prone to disease and less resilient in adverse conditions like drought. More importantly, lawn chemicals can build up in soil, leach into groundwater, and run off into streams and lakes. Some pesticides are quite stable in the environment, but can accumulate in the fatty tissues of animals and build up in the food chain. Lawn chemicals are also derived from fossil fuels and contribute to climate change.
We have also provided the citations for the Natural Lawn and Garden Care Basics here.