also: ういばな
noun
first flower of the season; first bloom on a plant
Refers to the very first flower to appear in a season or the first flower a plant produces. Can be used poetically or in everyday contexts.
庭の梅の初花が咲いた。
The first plum blossom in the garden has bloomed.
今年の初花は例年より早かった。
This year's first flowers came earlier than usual.
noun
first menstruation; menarche
Only with reading はつはな
A euphemistic or literary term for a girl's first period. Restricted to the reading はつはな.
初花を迎える年頃の娘に、母がそっと話をした。
The mother gently talked to her daughter, who was around the age of menarche.
noun
young woman who has just come of age
Only with reading はつはな
Poetic or old-fashioned term for a woman who has recently reached adulthood. Restricted to the reading はつはな.
初花のような美しさで、彼女は舞踏会に現れた。
She appeared at the ball with the beauty of a young woman just come of age.
Compound of 初 (hatsu, 'first') and 花 (hana, 'flower'). The extended meanings (menarche, young woman) are metaphorical uses of the 'first flower' image.