Meaning

noun someone who takes care of a garden

noun someone employed to work in a garden

originFrom Middle English gardener, either calqued or loaned from Anglo-Norman and Old Northern French gardinier. See garden, and compare German Gärtner (“gardener”), which is equivalent to a derivative of the German cognate to English garden, Garten (“garden”), + -er. Displaced native Old English wyrtweard (effectively "wortward").

Etymology from Wiktionary, CC BY-SA 3.0