An update.

Last time these saw centre-stage A. N. Other remarked on their dilapidated state.  That, probably, was not the adjective employed - BUT - for the record, all, bar the centre one which was deemed DoA, have been on the go since at least May 2010, by which time we'd had "it"/them long enough to show flowers not visible at purchase.

I haven't counted the generations, but the tatty group at the left are direct descendants of the first one. 
The untidy heap at the right at one time numbered 6-8, from the original one. 
Only the centre one is a replacement of a replacement, at least.
T. B. H. I haven't seen a flower for a while, but then, I can't say I've flowered recently either. 
Big BUT - they'll have to be "Past the Bucket" or even well "Beyond the Pale"; utterly and irrevocably DEED, before they're ousted.

Must chase them up B. T. W. as I started linking them upstream from 2010, then lapsed = a job to while away the hours if ever there was one?