Possibly a Male Fern. Looks nice when small but will grow into a big, thuggy thing in the wrong place.

Thanks for the suggestion. It sure looks pretty close - maybe the jury is out till it gets a bit bigger.

Looks a bit lightweight for one of those to me but best to wait for an ID until its bigger. A lot of ferns are identified on features like spore shape and colour ,as well as leaflet shape and whether there are little brown bracts on the stem, and immature ones don't show these features.
the little leaflets are toothed at the edges which does point to male fern though.