If you want a vibrant, chemical-free vegetable garden, companion planting is the solution. Did you know tomatoes produce a natural insecticide that can help protect carrots against pests? Or that planting mint near lettuce can repel slugs? Every gardener knows that the key to an abundant harvest in their vegetable garden is controlling pests and disease, while still maintaining a healthy growing environment. But it is possible to have a healthy, thriving vegetable garden without using dangerous chemicals? It is, as long as you know how to pair up the right plants.