No flowers on bergenia

I have bergenia in several places round my garden but they have flowered less and less since we moved here nearly 4 years ago, so far no flowers this year, whereas I noticed lots of flowers on those at the hospital we have just attended.  They are not gappy and have lots of healthy leaves. Should I be dividing them and replanting the youngest bits?  Is it too late to do it now?  If not, do I dig in a lot of compost, adding some fertiliser (e.g. blood, fish and bone), before replanting?

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