Maya Angelou likely enjoyed gardening. She said, “In diversity there is beauty and there is strength”. That is how the healthiest of ecosystems, including home gardens, function. Vegetable gardens are generally diverse. However, each group of a particular vegetable is rather homogenous. Crop rotation can compensate with diversity through the seasons.
Crop rotation is growing different vegetables in particular places from season to season. It is the same as growing particular vegetables in different places from season to season. Distinctly consumptive vegetable plants should relocate each season. Less consumptive sorts may perform adequately in the same place for years. Diversity makes it interesting.
Each type of vegetable plant consumes particular nutrients from the soil. Eventually, they can deplete their soil of these particular nutrients. Crop rotation allows them to utilize the nutrients they need from undepleted soil instead. Meanwhile, other vegetable plants can grow in the vacated soil. These different types of plants utilize different types of nutrients.
For example, tomato plants notoriously deplete the soil of particular nutrients. Corn does the same. However, each depletes different nutrients. Therefore, corn can be satisfied in soil vacated by tomato plants. Likewise, tomato plants can be satisfied in soil vacated by corn. Furthermore, each promotes the restoration of the soil nutrients needed by the next.
Crop rotation also disrupts proliferation of several pathogens that infest vegetable plants. Dormant spores of bean rust disease overwinter in the soil beneath infested bean plants. They efficiently infest any receptive bean plants to occupy the soil during the next spring. However, they can not infest plants that are not related to beans, such as pepper or okra.
Summer vegetables should be situated accordingly as they return to vegetable gardens. Tomato, pepper and eggplants are related, so should not grow where any grew last year. The same applies to bean and pea. Squash and cucumber are related also, but are less consumptive. They may perform adequately within the same soil for more than one year. Several summer and winter vegetables are related.