The Collaborative International Dictionary of English v.0.48:
Horticultural \Hor`ti*cul"tur*al\, a. [Cf. F. horticultural.] Of or pertaining to horticulture, or the culture of gardens or orchards. [1913 Webster]WordNet (r) 3.0 (2006):
horticultural adj 1: of or relating to the cultivation of plants