Plants That Help Potatoes Grow Better:
Beans, cabbage, corn, and horseradish all help potatoes grow better and improve the flavor of your potatoes when grown together.
Tansy, nasturtium, coriander, and catnip planted nearby repel Colorado potato beetle.
Interplant potatoes with lettuce, scallions, radishes, and spinach. All of these crops mature fast and will be harvested long before the potatoes are ready to harvest.
What Not To Plant with Potatoes:
Don't plant potatoes in an area that has been planted with any other Solanaceous crops in the last two years. This includes tomatoes, peppers, and eggplant.