Studies were carried out to determine the effect of time of inter‐planting centro (Centrosema pubescens) with cassava (Manihot esculentaCrantz), at various spacings, on the seed yield components of centro. Apart from the seed yield itself, time of planting centro did not have any significant effect on the number of flowers per inflorescence, pods per seedhead, seeds per pod and weight of 100 g seeds of centro. There was a negative correlation between seed yield and time of planting centro at all cassava interrow spacings. A similar correlation was found for cassava interrow spacing at the various times of planting the legume, due to a reduction in the population of centro. Seed yield was maximized (982 kg ha‐1) when centro was planted at the same time with cassava and at a spacing of 1 m × 1 m.