The Collaborative International Dictionary of English v.0.48:

Nurseryman \Nurs"er*y*man\, n.; pl. Nurserymen.
   One who cultivates or keeps a nursery, or place for rearing
   trees, etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nurseryman
    n 1: someone who takes care of a garden [syn: gardener,
         nurseryman]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "nurseryman":
   floriculturist, florist, fruit-grower, gardener, horticulturist,
   landscape architect, landscape gardener, landscapist,
   market gardener, olericulturist, orchardist, orchardman,
   truck gardener, vigneron, vinegrower, viniculturist, vintager,
   viticulturist