Rotating Crops

This doesn't mean planting them in the other direction or spinning them around. It means that you shouldn't plant tomatoes in the same place as last year. There are several reasons for this. One is that the fungi and diseases will build up in the soil and affect your plant the following year. Another is that each plant has it's own nutritional requirements. Planting in the same spot will use up all the plants favorite nutrients, and fertilizing won't truly replace them all. Some of the nutrients take longer for the microbes to convet to be usable by the plant. If you use my method where you dig a hole and completely replace the soil, that can help, but there could still be some of the old fungi nearby.