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对苜蓿开花习性的研究结果表明，每个花序上的小花由下向上开放，从第一朵花开放到最后一朵花开完需４～７天；小花均在白天８时左右开始开放，１０～１４时达到开花高峰，立秋前、后分别于２０、１８时停止开放。苜蓿是一种自然杂交率很高的植物，在自然条件下主要靠昆虫传粉进行异花授粉繁殖后代。人工去雄宜在花蕾发育至第３时期进行，去雄后即速套袋隔离，过１～２天的８～１４时进行授粉可保证获得真正的杂交种。
The results of alfalfa flowering showed that the flowers on each inflorescence were open from the bottom to the top, from 4 days to 7 days after the opening of the first flower to the last flower; all the flowers started to open around 8:00 in the daytime; 10 ~ 14 when flowering peak, before autumn, after 20, 18 pm to stop opening. Alfalfa is a high natural hybrid rate of plants, mainly in natural conditions by insect pollination cross-pollination of offspring. Artificial to male should be bud development to the third period, after the male immediately bagging isolation, over 1 to 2 days of 8 to 14 o’clock pollination to ensure that the real hybrids.