They are tiny. Tiny!
They grow in the waste places on the hills where it's not very fertile. Usually they have yellow centers.
I've looked at loads of pics of these online and seen no others that have the pink centers like ours.
Which means that we have a different variety from the standard yellow-eyed variety, but I cannot find any information on it.
I thought it might be a blue-eyed grass [Sisyrinchium campestre], but no. It's taller and has a different flower.
If you know anything about this variety, shout it out.
