The common forget-me-not, Myosotis scorpioides, in the Borage family, is a plant of European origin that is much naturalized in wet places and on damp ground. It is weedy in the garden but can be very beautiful when occurring spontaneously. It is considered a perennial but is pretty much an annual that reseeds itself. There are several native North American species but I am not familiar with them and most of what one encounters is, I think, the European species. There are other naturalized species as well. A species native to Alaska is the state flower. The Greek genus name refers to to the mouse-ear-like blue petals of the flower.
The forget-me-not has a rich history in literature and folklore. This grouping is along a retaining wall on a property fronting Hwy. 13 on the north side of Bayfield, but they grow everywhere the conditions are appropriate, and they often are a beautiful display in one location one year, and absent the next.
My recorded dates for first blooming of forget-me-nots are: 5/12/16; 5/05/15; 5/28/14; 6/05/13; 5/09/12; 5/25/11; 4/27/10. Pretty much all over the spring calendar, but since they are primarily annuals, I would expect them to be erratic.