Definition - What does Flower Bud mean?
A flower bud is a swelling or the formation of a premature flower bloom. A bud will eventually produce a flower.
As a plant matures it may form a flower bud from which it will produce a bloom and ultimately a seed.
MaximumYield explains Flower Bud
A flower bud is that immature bloom where seeds will form, allowing the plant to reproduce and ending its life cycle for the season.