Use plants and animals. Plants and animals can save you energy and do work for you. When enclosed in a weed infested area, they will destroy all vegetation, while turning and manuring the soil. Plants can play an important role in pest control. Marigolds and daisies attract insects which feed on garden pests.
Ponds attract insect-eating frogs.
Garlic and onion tend to repel many insects. Trees and vines, cleverly placed, can provide shade, windbreaks and firebreaks. Make sure that nutrients do not leave the farm or garden, but are cycled through it. Turn kitchen wastes and animal manure into compost, and leaves and dry grass can be raked around plants to form a mulch. South Africa is a dry country, and water is often a limiting resource.