1) Gardener 2) Horticulturist 3) Pediatrician 4) Plantsman 1) Gardener 2) Transplanter 
• (n.) One who cultivates or keeps a nursery, or place for rearing trees, etc. • (n.) One who cultivates or keeps a nursery, or place for rearing trees, etc.
One who is state certified to practice growing techniques of plant material making the proper selection for specific needs.
Nurs'er·y·man noun ; plural Nurserymen One who cultivates or keeps a nursery, or place for rearing trees, etc. 
One who is state certified to practice growing techniques of plant material making the proper selection for specific needs.
a person who owns or conducts a plant nursery.