Growing habits of one plant compliment the growing habits of another which will help the plant thrive to its potential.
One plant will attract insect predators that eat the insect pests on the companion. If you had planted 10 cabbages all together you would almost certainly lose several to moths or caterpillars unless you carried out regular spraying of insecticides which I feel isn't good for your health; however, if you plant them with celery and beets and some peas, you would have a successful cabbage crop. Caterpillars can't stand the smell of celery.
One plant will repel the pests that eat or damage its companion. For instance, pepper plants near cabbage will repel cabbage moths.
One plant disguises its companion so that pests do not recognize it.
One plant creates a micro-climate for another.
One plant attracts pollinators that are required by its companion. Colorful flowers like marigold or cosmos can attract bees, butterflies and moths that help pollinate the flowers of a pepper or tomato plant.
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|Asparagus||tomatoes, parsley, basil|
|Beans||potatoes, carrots, cucumbers, cauliflower, cabbage, summer savory, most other vegetables and herbs||onions, garlic, gladiolus|
|Pole Beans||corn, summer savory||onions, beets, kohlrabi|
|Bush Beans||potatoes, cucumbers, strawberries, celery, summer savory||onions|
|Beets||onions, kohlrabi||pole beans|
|Cabbage Family||aromatic plants, potatoes, dill, celery, chamomile, sage, peppermint, rosemary, beets, onions||strawberries, tomatoes, pole beans|
|Carrots||peas, leaf lettuce, chives, onions, leeks, rosemary, sage, tomatoes||dill|
|Celery||leek, tomatoes, c cauliflower, bush beans, cabbage|
|Corn||potatoes, peas, beans, cucumbers, pumpkin, squash|
|Cucumbers||beans, corn, peas, radishes, sunflowers||kohlrabi, potato, fennel, cabbage|
|Leek||onions, celery, carrots|
|Lettuce||carrots, radishes, strawberry, cucumber|
(carrots, lettuce and radish make a strong team)
|beets, strawberry, tomato, lettuce, summer savory,|
|Peas||carrots, turnips, radishes, cucumbers, corn, beans, most vegetables and herbs||onions, garlic, gladiolus, potato|
|Potato||beans, corn, cabbage, horseradish (should be planted at the corner of the patch), marigold, eggplant (as a lure for Colorado Potato beetle)||pumpkin, squash, cucumber, sunflower, tomato, raspberry|
|Radish||peas, nasturtium, lettuce, cucumber|
|Soybeans||grows with anything, helps everything|
|Strawberries||bush bean, spinach, borage, lettuce (as a border)||cabbage|
|Tomato||chives, onions, parsley, asparagus, marigold, nasturtium, carrots|