Always rotate crops
This is no folksy theory; it’s an important rule of vegetable gardening to reduce pests and diseases. Don’t grow a crop in the same location two years running. Crop rotation always promotes health. For instance, beans pump nitrogen into the soil and broccoli thrives on nitrogen-rich soil, so it’s smart to grow broccoli where beans were grown the previous year. Onions like weed-free soil, so it’s good to grow them after potatoes because the foliage of potatoes suppresses weeds. The British have a way of remembering how to rotate crops every three years by using the mnemonic British Rail Late: B for brassicas (cabbage, cauliflower, broccoli, brussels sprouts, kohlrabi), followed by R for root vegetables (beets, carrots, parsnips), followed by L for legumes (peas, broad and runner beans.) Leeks, onions, chives, and garlic all go in with legumes, which are followed by brassicas to complete the cycle.
Vegetables and herbs are seen in first lady Michelle Obama’s garden on the south Lawn of the White House in
Vegetables grow best in soil that is sweet
or slightly more alkaline than acidic.