Definition of late-blooming in US English:

late-blooming

adjective

  • 1(Of a plant) blooming relatively late in the growing season, typically in late summer or early autumn.

  • 2Figurative that develops or occurs relatively late in a person's life; (of a person) developing a skill, interest, etc., later in life.

Origin

Early 17th century; earliest use found in Thomas May (d. 1650), writer and historian.