Plant the same vegetable in the same soil site no more frequently than once every other year (a 2-year rotation). If possible, routinely rotate on a 3- to 8-year basis.
Same soil site is defined as a radius of 10 feet from where the vegetable has been planted.
So, rotation can occur within the same growing bed as long as the vegetable is planted at least 10 feet away from where it was the previous year.