Companion Planting In Your Garden

http://www.albertahomegardening.com/does-companion-planting-work-just-ask-my-beans/

Onion - plant with parsley to keep away onion fly
Celery – plant with cabbage, broccoli, or cauliflower to deter butterflies (grows well with beans, tomatoes, and leeks)
Asparagus – plant with tomatoes, parsley, or basil
Swiss Chard – plant with cabbage, broccoli, cauliflower, onions, lettuce, or herbs - do not plant with string beans
Beets – plant with kohlrabi, carrots, cucumber, lettuce, onions, cabbage, broccoli, or cauliflower - do not plant with string beans, dill, or fennel
Brussels Sprouts – plant with onions
Cabbage – plant with herbs, onion, garlic, peas, celery, potatoes, or beets
Kohlrabi – plant with beets or onions
Peppers - plant with basil, okra, or tomatoes
Cucumber - plant with corn, sunflowers, peas, beans, beets, or carrots
Pumpkin & Squash - Plant with corn, peas, or beans
Carrot – Plant with onions, annual flowers, lettuce, radishes, tomatoes, or peas - do not plant with anise and dill
Lettuce – Plant with cucumbers, onions, radishes, carrots, or dill (dill protects them from aphids)
Tomato - Plant with basil, parsley, and asparagus or French marigolds (French marigolds deter whiteflies)
Bean – plant with celery, corns, cabbage, broccoli, cauliflower or melons
Peas – plant with beans, root crops, potatoes, or corn
Radish – Plant with peas or lettuce
Potato - plant with corn, cabbage, beans, or marigolds
Spinach – plant with beans, peas, corn, and strawberries
Corn – Plant with beans, peas, sunflowers, cucumbers, squash, melons, and potatoes