* -er: This suffix is used to denote someone who works in a garden, like gardener.
* -ing: This suffix can be used to indicate a place where something is grown, like gardening (as in a gardening area).
* -y: This suffix can be used to indicate a place that resembles a garden, like flowery (a place with many flowers).
Ultimately, the best suffix to use depends on the specific meaning you want to convey.