By planting to attract beneficial insects and to detract from others it eliminates the need for using man made chemicals and insect repellents, a process often known as companion planting.
livinggreenmag.com Companion planting increases harvest rates, serves as natural pest control, fertilizes soil, creates shade and reaps an impressive garden.
www.huffingtonpost.com A healthy soil full of active fungi and microbial life, combined with a diverse crop (making use of companion planting), suppresses weeds and pests naturally and retains rainwater.
en.wikipedia.org Sustainable gardening uses organic horticulture methods, such as organic fertilizers, biological pest control, beneficial insects, and companion planting, among other methods, to sustain an attractive lawn in a safe garden.
en.wikipedia.org