This bright and charming volunteer showed up in the middle of a large expanse of achillea (yarrow) in early July and it is still blooming. The largest of the daisy-like blossoms is at least 4 inches in diameter. What is this welcome interloper and where did it come from? I hope it's a hardy perennial and that it comes back next year, but if it does, I may move it out of the middle of the yarrow.
