Garden vegetables belong to families of related plants.
These families tend to share pests and diseases. Rotating families can keep you garden healthy.
Pests and disease spores overwinter in the soil and on crops residues. You can prevent many problems by hot-composting crops residues rather than leaving them in place. Moving each crop family from year to year helps them get a good start without last year's pests waiting for the new seedlings.
Here is a gardener's list of families:
Parsley Family (Umbellifers):
carrots, dill, fennel, parsley, parsnips, cilantro, caraway, celery, cumin
Aster Family (Composites):
lettuce, chickory, sunflowers, artichokes, cardoon, endive
Cabbage family (Brassicas):
broccoli, cabbage, cauliflower, mustard, Asian greens, Brussels sprouts, Turnips, radishes, cress.
Tomato family (nightshades):
tomatoes, potatoes, peppers, eggplants, tobacco, petunias
Squash family (cucurbits):
winter and summer squash, cucumbers, melons, watermelon
Bean family (Legumes):
peas, beans, cowpeas, vetch, favas, soybeans, astragalus, sweetpeas
Spinach family (goosefoot or chenopods):
spinach, chard, beet, quinoa, lambsquarters, magentaspreen, epazote
Hibiscus family (mallows):
Okra, hollyhocks, marsh mallow, hibiscus, jamaica, Egyptian spinach, jute
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