IPA: /ˈɡɑːrdənər/
KK: /ˈɡɑrdənər/
A person who takes care of a garden, growing plants and flowers either for enjoyment or as a job.
The gardener planted new flowers in the spring.
Gardener → It is formed from "garden" (from Old French *garden*, meaning an enclosed space for growing plants) and "-er" (meaning a person who). A gardener is a person who tends to a garden or grows plants.
Think of someone who works in an 'enclosed space for growing plants' — that's what a gardener does.