A few suggestions for getting mutually beneficial plants together.
Corn, Beans, and Squash – The corn shoots up first. The beans grow up the corn stalk but don’t choke it. The squash emerges last, radiating outwards on the ground, protected in its youth by the established corn and beans. Lettuce and spinach in between the squash benefit from the shade of the corn and are harvested before the squash takes up the whole space.
Herbs and Veggies – Plant herbs like dill, parsley, and cilantro around your garden borders. They confuse many harmful insects from getting into the middle. They also attract bugs like praying mantises and ladybugs who will eat the pests.
Tomatoes and Basil – The herb protects the tomato from worms and other pests.
Cucumbers, Melons, Nasturtiums – All great vine plants that run riot together, attracting friendly insects.
Marigolds – These are great flowers to put near a vegetable garden. They repel many ground pests, like nematodes and beetles.
This list will be further updated as I experiment more with plant pairings.