I planted V. betonicifolia many years ago but over time it has morphed into what is in the photo. I am wondering if it has hybridised with the introduced violet which is pretty rampant around here
Oop, not sure how I missed the tag! Tina is right on the money this is the exotic V.riviniana, apparently someone will need to add it which I can do shortly. It’s quite different from V.betonicifolia so I’m guessing what’s happened here is the appearance of a sinister doppelgänger.