If you believe Reddit and other online forums, you may hear that the purple flowers in the ditches are NOT invasive species.

A super-cold-hardy dusty miller, a double-award-winning purple-blooming ... beauty of the flowers and by how long they lasted – into October, beyond the season’s first light frost.

Half buried in the sand, several slender grey-green stems stretch across the dusty ground supporting a scattering of delicate light purple flowers. Sleisla (Eremobium aegyptiacum), is a woody herb ...