Tradescantia ohiensis
It really looks like the exact same flower to me. So until another person wants to prove it's not, I'm keeping this ID. :)
And besides, nowadays you can find almost any flower, plant or tree all over the world. The only thing is, it needs the same kind of habitat to survive. Maybe in Holland it can only give one flower, while in your country it's tree at a time.
Just like lots of fruit trees grow here, yet they don't all give fruit or at least eatable fruits. this environment is just not good enough, or not that bad.
I copied the species name for mine and just realized yours is in Europe - you may want to double check on the species name. Cynthia
I have the same flower
http://www.projectnoah.org/spottings/660...
Its a beauty isnt it? Vibrant colors
Lat: 52.37, Long: 4.89
Spotted on Jun 23, 2011
Submitted on Jul 2, 2011