Experiments were carried out at Wageningen to develop a practical method of seed production from beet in one year. It was shown that natural cold, affecting plants sown in frames at the beginning of January, had a stronger flower promoting effect than artificial vernalization. Supplementary lighting to extend the photoperiod to 24 hours markedly increased the number of good seed plants. Early sowing plus supplementary light until transplanting with the varieties Egyptische Platronde and Noord-Hollandse Bleekblad increased the percentage of good seed plants, to 96-100%. (Abstract retrieved from CAB Abstracts by CABI’s permission)