Yes, this roots well and quite quickly from autumn material, still reasonably soft. I do most herbaceous things (though this is really sub-shrubby) from softish tip cuttings of new, after flowering growth. This is a lovely plant for the edge of a trough or, no doubt, a crevice. I didn't realize it was Irish.
I think my plant came as H. c. balcanicum so maybe it's widespread through Europe?