I saw these in the mild West of Ireland. Deserted and tumbledown houses would have a flourishing clump in their front garden with nothing else left . They like damp spots.
I have bought pot plants but they are not as big as the Irish ones, and they come in colours, while the Irish ones were all white. I don't think they are hardy outside here unless you are somewhere without winter frosts.After mine have finished flowering I leave them somewhere on a window ledge to recover, warering them until the leaves die down. They look straggly and awful so a spare bedroom is best. Then I trim off the dead leaves and put the pot away somewhere for several months (unwatered) After a decent interval, I bring the pot back, water it well and put in somewhere warmish to wake up again. They have reflowered several times with this treatment.
The leaves and flower shoots seem to grow taller when they reflower - I wonder whether they had been treated somehow to stay shorter?
