Discover the 8 best and 4 worst companion plants for peas in your garden. Plants that make good companions for peas include beets, turnips, lettuce, kale, spinach, sweet alyssum, carrots, and corn. · learn how to grow peas with other plants that benefit from nitrogen fixation, beneficial insects, and natural shade. · the best companion plants for snap peas and snow peas (and other types, too!) will help reduce pests, increase beneficial insect activity, and even improve the flavor and yield of the peas. It is best to avoid planting tomatoes, onions, garlic, and peppers alongside peas, as they can negatively affect their growth. · learn what vegetables and herbs are the best companion plants for peas and those to avoid planting in close proximity.