This is a mystery left over from September when I spotted the flower peeping out from under the decking. A perennial, it is now coming up again for the summer and I’ve been able to identify it as a Fringed Willowherb, also known as American Willowherb, as it was first recorded in the British Isles in 1891. It prefers a damp habitat but can also be seen in gardens and roadsides. The flowers are tinier than the Great Willowherb.
