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The relationship between population and yield of garden peas (cv, 'Greenfeast') was investigated under different moisture regimes. In one season the trial was harvested at the green pea stage. Maximum population tested was 82 plants per rn-', which is about that used in normal farm practice. Yield increased with population, and there was no indication of optimum population having been reached either with or without irrigation. Yields of unirrigated peas were low, but the average yield response to irrigation was 241%. In the second season the trial was harvested at the seed stage. There were two irrigated treatments showing yield responses of 79 and 114% over the unirrigated treatment. Populations up to 250 plants per m-' were tested, and peaks in yield were found. The optimum population was found to increase with improved moisture conditions.