Every year, I plant maybe 50 crocuses in the garden. Every year, maybe half of them flower and practically none of the ones planted in previous years flower. These, however, were here when we bought the house 20 years ago and they come back every time. They seem to have taken the opportunity presented by the mild winter to start spreading.
That's great! If they take over the entire lawn, I won't have to spend 2 hours every summer weekend mowing it.