effloresce (v.)

"to come into flower," 1775, from Latin efflorescere, inceptive form (in Late Latin simplified to efflorere) "to blossom, spring up, flourish, abound," from assimilated form of ex "out" (see ex-) + florescere "to blossom," from flos "flower" (from PIE root *bhel- (3) "to thrive, bloom"). Sense in chemistry is from 1788.