Here are the major vegetable plant families and suggestions for crop rotation:
Onion Family, Amaryllidaceae: Garlic, onions, leeks, shallots. These are light feeders. Plant onion family crops after heavy feeders. Follow onion family crops with legumes.
Cabbage Family, Brassicaceae (Cruciferae): Broccoli, Brussels sprouts, cabbage, cauliflower, Chinese cabbage, collards, cress, kale, kohlrabi, radishes, turnips. These are heavy feeders. Plant cabbage family crops after legumes. After cabbage family crops build the soil for a season with a cover crop or soil building compost or let the area sit fallow for a season after applying well-aged manure.
Lettuce Family, Asteraceae (Compositae): Artichokes, chicory, endive, lettuce. These are heavy feeders. Follow lettuce family crops with soil building legumes.
Grains, Grass Family, Poaceae (Gramineae): Grains--oats, corn, rye, wheat. Follow these crops with tomato family plants.
Legume Family, Fabaceae (Leguminosae): Beans, peas, clover, vetch. These are soil enrichers. Follow legume family plants with any other crop.
Tomato Family, Nightshade Family, Solanaceae: Eggplant, peppers, tomatoes, potatoes. Nightshade family crops are heavy feeders. Plant these crops after grass family plants. Follow heavy feeders with legume family crops to re-build the soil.
Squash Family, Cucurbitaceae: Cucumbers, melons, summer and winter squash, pumpkins, watermelon. Squash family plants are heavy feeders. Plant these crops after grass family plants. Follow heavy feeders with legume family crops to re-build the soil.
Carrot Family, Apiaceae (Umbelliferae): Carrots, celery, anise, coriander, dill, fennel, parsley. These are light to medium feeders. Carrot family crops can follow any other crop. Follow carrot family crops with legumes or onion family crops.
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