Successional sowing is a technique which involves sowing seeds of the same plant on a number of occasions over a period of time, at regular intervals.
This is a useful technique used by many allotment holders. This ensures crops become ready to harvest in a staggered manner, over a longer period of time, preventing the classic glut and famine problem often experienced. This technique can also reduces the problems associated with a crop failure due to climatic changes, as hopefully only one of the batches will be affected at any one time. Try successional sowing with your peas, salads and carrots.