|Milan, Robert and Anne planting onion sets.|
|Robert, Milan and Jim planting garlic sets.|
year 1 = solanacea (the potato family) which here means a strip full of potatoes;
year 2 = legume (the pea family) so peas and beans, with other crops such as courgette and sweetcorn too;
year 3 = brassica (the cabbage family); and
year 4 = allium (the onion family) with carrots and parsnips also included.
This crop rotation system, and variations of it, is organic farming's main tool for the reduction of crop pests and diseases. Each crop family is moved on year after year, so that their specific problems do not build up in the soil, which would happen if the same crops are grown in the same soil continuously.