ichidan verb, transitive verb
make bloom; bring into bloom
Transitive verb meaning to cause flowers to bloom, either literally or figuratively (e.g., talent, romance).
彼女は庭にバラを咲かせた。
She made roses bloom in the garden.
努力が才能を咲かせる。
Effort makes talent bloom.
咲く is intransitive ('to bloom'), while 咲かせる is its transitive counterpart ('to make bloom').
Causative form of 咲く (saku, 'to bloom'), formed by adding the causative auxiliary せる to the stem 咲か-.