We were given one in a pot about 20 years and three houses ago. It’s still with us, and pops up seemingly randomly. We’ve never tried to put it anywhere or collect and sow seeds, so all a bit of a mystery. Currently flowering happily in the gravel in front of the garage.
Posts
Very pretty perennial. Obviously quite happy under your hedge!
https://www.rhs.org.uk/Plants/17398/Sisyrinchium-striatum/Details
https://forum.gardenersworld.com/discussion/1029406/perennials-that-don-t-come-back/p1