Ginger goes everywhere. I cant imagine how it migrates.I have never seen a bloom that would allow seed dispersal.

What kind of ginger?

This kind.Its impossible to kill. I transplanted 2 big clumps in our mild January. Nothing phased them.

They bloom down low under the leaves...at least mine do...

That must be it.Do yours spread?

Hardly at all. Mine's the wild one.

Mine must be wild too it was a housewarming gift 5 years ago.

JoAnn ,
yours looks like the European wild ginger ( Asarum europaeum)
and LeeAnne's looks like the native wild Canadian ( Asarun canadense)
These type of gingers Mostly spread from underground rhizomes.

I have enough now and will toss any I find in places they dont belong instead of transplanting.

Yours does look more like European but mine spreads very slow, wish mine would take off.They are not cheap.

Looks like it would make a beautiful groundcover! A plant is only a weed if it's growing where you don't want it.