Hyacinthoides hispanica

Some time ago there was a project/research in the Netherlands where people were asked to let 1 square meter of garden run its course, and not exert any influence on it, for a year. You then had to keep track of what things you saw change: animals, plants... We did not participate in the official research, but we did let a little part of the garden do its thing. And now suddenly a whole group of these plants are blooming. Nice, and no idea how they got there!