Old potato coming up from last year ?

[lakelady]

I finally got around to finishing up spring clean up in the yard and bagging another 30 bags of leaves (ugh I know). In clearing out the leftover hay mulch and some leaves out of one bed, lo and behold, a little potato plant is growing. I guess I missed one last summer, and I know it was a little purple potato I'd grown on a lark from the farmers market. So, my question is, will a complete plant grow this year from this old potato and is it safe to eat them? If not, I'll yank it out.

I didn't do much as far as "hilling" as I'd never really grown potatoes before but thought what the heck for fun, let's put these in here and see what we get. I got a nice little bunch of tiny purple potatoes , they were so cute!