Nightshade family: Peppers, tomatoes, potatoes, eggplant, tomatillos.
Mustard family: Horseradish, cabbage, cauliflower, broccoli, kohlrabi, kale, Brussels sprouts, turnips, radishes, mustard, collards, watercress, rutabaga.
Squash family: Cucumbers, melons, squash, pumpkins, gourds.
Rose family: Apples, peaches, apricots, nectarines, plums, strawberries, blackberries, raspberries, pears, cherries.
Legume family: Beans, peas, lentils, peanuts, soybeans (edamame).
Grass family: Corn.
Knotweed family: Rhubarb.
Lily family: Asparagus, onions, leeks, chives, garlic, shallots.
Blueberry family: Blueberries, cranberries.
Goosefoot family: Spinach, beets, chard.
Carrot family: Carrots, parsnips, celery.
Sunflower family: Lettuce, endive, escarole, radicchio, artichokes.
Source: Virginia Cooperative Extension