Significant differences in nectar production were observed among seven cultivars and one germplasm release of birdsfoot trefoil (Lotus corniculatus L.). The cultivars Carroll and Leo were consistently higher and Maitland consistently lower in μ1 nectar/umbel produced. Nectar production varied significantly among genotypes within cultivars and germplasm. Four parents, two high and two low nectar producers, were crossed in a diallel to determine the inheritance pattern for nectar production. The progeny of these crosses were near the midparent values. General combining ability effects were highly significant while specific combining ability were unimportant. Broad sense heritability was 92%. The heritability estimates from the analysis of variance were used to predict response to selection in a breeding population. The results indicated that selection for low nectar production would be more effective than selection for high nectar production.