The Collaborative International Dictionary of English v.0.48:

Florescence \Flo*res"cence\, n. [See Florescent.] (Bot.)
   A bursting into flower; a blossoming. --Martyn.
   [1913 Webster]

WordNet (r) 3.0 (2006):

florescence
    n 1: the time and process of budding and unfolding of blossoms
         [syn: blossoming, flowering, florescence,
         inflorescence, anthesis, efflorescence]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "florescence":
   anthesis, bloom, blooming, blossom, blossoming, blow, blowing,
   budtime, early years, efflorescence, flowerage, flowering,
   flowering time, full bloom, jeunesse, juvenescence, juvenility,
   my burning youth, my green age, prime of life, salad days,
   seedtime of life, springtime of life, tender age, tenderness,
   unfolding, unfoldment, young blood, youngness, youth, youthfulness,
   youthhead, youthhood, youthiness