The flowering time of Vitex negundo is May and July every year. If Vitex negundo is planted in the north, the flowering time will be correspondingly later, and Vitex negundo in the north will bloom in June. The reason for this difference is that the temperature difference between north and south is relatively large. Vitex negundo has a special fragrance when it blooms, attracting many bees to collect honey.

The flowering period of alfalfa is usually from May to July every year, and the flowering period lasts for a long time. The flowers are elegant and beautiful purple, which is a kind of pasture. It is planted all over China and widely cultivated all over the world. Its feeding value is particularly high, mainly because alfalfa is rich in nutritional value, protein, minerals and dietary fiber. It is especially suitable as delicious feed for cattle, sheep and pigs.