When do the flowers in a left-alone yard become wild flowers?

For many years crocuses, violets and primroses brought joy to our northern hearts, colourfully announcing the end of winter and the beginning of spring. Perhaps some of my more knowledgable followers will answer the question above. The crocuses had once been planted many years ago. The same happened to the primroses that keep coming back as companions of a mountain ash tree. Most impressive are the violets that have spread on a shady area in the backyard. Their numbers have multiplied and turned into a veritable floral carpet. Another discovery yesterday was the hairy bud of a magnolia bush. Give it another week and the insects will have a feast. They will come without any special invitation.