Sinapis Alba

As you can see in the extra, a yellow spot in the green meadows attracted me (and others, from far). It was weird to see just this spot yellow, nothing more. So I had to go there and find out.
It happened to be a couple of square metres of White Mustard. Because of the yellow flowers it is also called yellow mustard (in German: Gelbsenf).
Someone must have lost a load of mustard seeds.
Thanks to Miranda1008 for hosting the Wildflower Week challenge.