abstract: A two year field experiment (2002 and 2003) was conducted to examine the effect of harvest time of two cultivars of blueweed: Blue Bedder and Mixed Bedding. Seeds were sown in the middle of April, in rows 45 cm apart at the rate of 5 kg ha-1. Plants were harvested at two stages: when 50% and 70% of seeds achieved ripeness. Delay of harvest up to the second stage resulted in a decrease of 1000 seeds weight and total yield of both cultivars (on average by 33%). Mixed Bedding produced bigger seeds, gave slightly higher yield, and the seeds contained more fat, GLA and SDA. The influence of harvest time on quality of seeds differed: delay of harvest of Blue Bedder led to a decrease in fat content and increase of GLA and SDA, while in the case of Mixed Bedding the content of those fatty acids decreased.