cultivator

Short definition from Wiktionary

Noun

1. 1
   Any of several devices used to loosen or stir the soil, either to remove weeds or to provide aeration and drainage.
2. 2
   A person who cultivates: Someone who uses a cultivator (implement, device, or machine).
3. 3
   A person who cultivates: Someone who grows plants.
4. 4
   A person who cultivates: Someone who fosters something besides plants (such as human development or relationships).