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Crop Rotation in the vegetable garden

In order to sustain the productivity of the vegetable garden over  a number of years we must practice the process of crop rotation. Crop  rotation means growing a set of different crops in a certain area  of the vegetable garden each year. Crop rotation normally follows  a three year cyle where the vegetable plot is divided into three areas  and three different sets of crops are grown each year.


Area 1 Brassicas Root crops Legumes
Area 2 Legumes Brassicas Root Crops
Area 3 Root Crops Legumes Brassicas


Maintaining soil fertility with crop rotation?

The first is that the different vegetable crops we grow have different  nutrient needs from the soil. If we grew the same crop in the soil each  year then the nutrient types in the soil that the particular crop required  would soon be used up. This would lead to progressively declining crop  yields each year. By rotating the crops we can balance the nutrient  demands on the soil so that one particular nutrient set isn’t  exhausted.

Certain crops can actually provide benefits to the soil for one of  the other crop groups. An example of this is the legumes group. The  roots of peas and beans actually fix nitrogen in the soil. Nitrogen  is required for leaf growth and so the Brassica group and leafy greens  are normally planted the in the site of last years peas and beans.

Using crop rotation to aid in pest and disease control

Another important reason for using crop rotation is that it can help  prevent the build up of pests and diseases that occur in the vegetable  garden and will reduce your crop yields by attacking your plants.  The practice of crop rotation is therefore one of the foundations  of organic vegetable gardening as it can reduce the need for chemical  methods of pest or disease control.

If you change the crops you grow each year then plant or plant group  specific pests and diseases (such as Carrot fly) will not have the  same crop to attack the next year. This makes it harder for them to  sustain their presence in the soil.

What vegetables are included in the three different crop groups?


Group 1
Brassicas and leafy greens
Group 2
Root Crops
Group 3
Legumes + others
    Brussel Sprouts