noun. One who practises the art of horticulture; a gardener; especially, one who practises gardening on a large scale or as a profession.

noun. One who practices horticulture.

noun. A gardener; a person interested or practising horticulture.

noun. an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants)

"The horticulturist should be a natural optimist and always anticipate something good ahead, which is one pretty sure way of getting it."

''Wikipedia'' has a list of horticulturists  horticultural  horticulturally  horticulture  

expert  

Burbank  gardener  luther burbank  nurseryman  

agriculturalist  attender  blatting  botanize  cac