This is the 4343rd most frequent Chinese word.
开花
"开花" means "to bloom" or "to blossom."
Here, "开花" (blooming) describes the process of flowers appearing on a tree.
树上开的花真美。
The flowers blooming on the tree are truly beautiful.
In this sentence, "开花" indicates the general phenomenological event where plants produce flowers in the season.
这个季节大部分植物都会开花。
Most plants bloom during this season.
"开花" is used to express anticipation for the rose plants to produce blossoms visibly.