You probably know where you planted squash in your garden last year but what about the year before or even three years ago? Did you also plant cucumbers or melons? This is important information to keep track of so you can maintain a rotation schedule for the vegetables you grow in your garden.
Planting the same vegetables, or even related vegetables, in the same spot year after year can encourage a damaging build-up of pests and disease; crop rotation helps disrupt recurring cycles of infection by moving host vegetables to a different area of the garden, thereby thwarting the efforts of diseases or pests that may be left in the soil from a previous crop.
For example, squash, cucumbers, pumpkins and melons, all members of the cucurbit family, are susceptible to various diseases that overwinter in crop residue from diseased plants, but moving them out of their previous growing area means they won’t be available to support those diseases.
Below are nine plant families that are primarily grown in vegetable gardens, along with the different vegetables that belong to each family. For simplicity’s sake I’ve used a common vegetable name for each family, followed by its botanical name:
Cabbage Family (Brassicaceae)
Beet Family (Chenopodiaceae/Amaranthaceae)
Legume Family (Fabaceae)
Mallow Family (Malvaceae)
Nightshade Family (Solanaceae)
Onion Family (Alliacaeae)
Carrot Family (Apiaceae)
Squash Family (Curcurbitaceae)
Lettuce Family (Asteraceae)
Since vegetables in the same families are generally susceptible to similar pest and disease issues gardeners are encouraged to rotate crops by family, thereby thwarting the efforts of diseases or pests that may be left in the soil from a previous crop. This may not prevent re-infection completely, but it does slow down the spread of soilborne diseases and pests so that plants rotated to other areas have a chance at a vigorous start.
How you choose to practice crop rotation will depend on the size of your garden, the number of different vegetables you grow and how much effort you want to invest. The idea here is to rotate crop families to different areas, rows or beds in a vegetable garden over a 3 year period. For example, my garden consists of 5 wide rows numbered 1-5. Each year I maintain records of my plantings and a simple diagram of my garden. This year tomatoes, eggplant and/or peppers will occupy Row 2, next year they will move to Row 3, then to Row 4 and eventually back to Row 1. I also have four raised beds as well as large pots and straw bale gardens that I sometimes utilize in the rotation – these allow me to expand my plantings or even rotate a crop family out of my garden completely if I notice a persistent pest or disease.
Additionally, I may incorporate a row of sweet potatoes (morning glory family) or corn (grass family) into the rotation since these represent two completely different families, or I may leave a bed fallow and cover it with a layer of mulch – all of these efforts to remove and relocate a host vegetable means there is less opportunity for a pest or disease to reproduce and spread once it emerges from the soil.
If you have a permanent trellis or vertical structure in your garden think about rotating vining or climbing plants, such as cucumbers, pole bean or even tomatoes in the warm season and vining sugar snap peas or sweet peas in the cool season. I also like to incorporate climbing flowers, such as moonflowers and morning glories, as part of my vertical rotation.
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