The best companion plants to choose for your basil will help repel pesky insects, attract beneficial insects, and help improve overall growth and taste. Plants like asparagus, borage, root vegetables, garlic, tomatoes, marigolds, broccoli, chives, and oregano are just a few companions that work together with the basil to create healthy growing conditions. Read more to find basil's best companion plants and learn why they work so well together in your vegetable garden.