intransitive verb
Definition 1
Produce flowers, bloom or blossom.
Source: Concise Oxford Dictionary
Context: These interactions [changing day length, weather] tell animals when to mate, migrate or hibernate – and plants when to flower and shed their leaves.
Source: Financial Times 06/07/2009 (Clive Cookson, reviewing Seasons of Life: The Biological Rhythms that Living Things Need to Thrive and Survive, Russell Foster and Leon Kreitzman)
Definition 2
Figuratively, of persons or of things other than plants, flourish, grow strong, thrive.
Source: Invertext
Context: In 1971 he [Michael Jackson] launched his solo career, which flowered with his hit album Off the Wall in 1979 and then went stratospheric with Thriller, the most successful album in history.
Source: Financial Times 26/06/2009 (Ludovic Hunter-Tilney)