noun
flowering season; blooming period
Refers to the time of year when a particular plant species blooms.
桜の花期は短い。
The cherry blossom season is short.
この植物の花期は春から夏にかけてです。
The flowering season of this plant is from spring to summer.
開花 refers to the act of blooming or the state of being in bloom, while 花期 specifically denotes the season or period of blooming.
Compound of 花 (flower) and 期 (period, season).