Definition of overbloom in US English:

overbloom

verb

Horticulture
  • with object (refl.) and without object. Of a plant or tree: to bloom or flower excessively, especially so as to undermine its strength.

Origin

Mid 19th century; earliest use found in Florist's Journal. From over- + bloom.

Pronunciation

overbloom

/ˌəʊvəˈbluːm/