Noun, Noun which may take the genitive case particle 'no'
flowers in full bloom; time of year in which flowers are in full bloom
庭のバラは今花盛りです。The roses in the garden are in full bloom. the age at which someone (esp. a woman) is at the peak of their beauty
booming or peaking (in popularity)
Also written 花ざかり【はなざかり】