Basil has over 10 varieties and sub-species of basil that produce aromatic leaves that smell anywhere from sweet to pungent, licorice to lemony, spicy to balmy. Basil can be grown in near vicinity to tomato plants where the plant will help to deter mosquitoes and flies. Basil prefers to have a sunny location, in soil that retains moisture and is rich in organic matter. Use the variety of basil to enrich tomato dishes, sauces, soups and salads.