Not rare or difficult - I don't know about everywhere else but mine are have a great year following all the wet! 001 by charliepridham, on Flickr 002 by charliepridham, on Flickr
Really love that picture Charlie but they never look like that here, if the snails and slugs don't ravage them some sort of sawfly larvae obliterates them in a matter of days!
I get the sawfly too, but usually after the flowers go over so I put up with it and don't spray, they used to be much smaller and miserable looking things but years of chucking mulch down has made the soil more water retentive and to their liking
Mine are surprisingly good this year too. Moved them with me last spring and it can be a bit of a punt when re-siting plants into different soil conditions.
I also bought my Uvularia grandiflora with me which has really "enjoyed" the move. Looks far too good (almost exotic) for a hardy spring bloomer................