The Collaborative International Dictionary of English v.0.48:

Grower \Grow"er\, n.
   One who grows or produces; as, a grower of corn; also, that
   which grows or increases; as, a vine may be a rank or a slow
   grower.
   [1913 Webster]

WordNet (r) 3.0 (2006):

grower
    n 1: someone concerned with the science or art or business of
         cultivating the soil [syn: agriculturist,
         agriculturalist, cultivator, grower, raiser]