I found this small purple plant in the garden last year, I potted it,
then all its purple-ish foilage came away so i thought it was dying
but this year i got a pinkish single flower so far. Also the leafs
look greenish this year. It may get darker later i think.

Is this a ... burgundy cherry tree?

http://i44.tinypic.com/2e2dlkp.jpg

thank you in advance.