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You will need to divide your bergenia about every four years. About that time you will notice that the plants have become open in the center. Wait until spring to lift the clumps, then with a sharp knife, cut the thick stems apart to divide the plant and replant.
In this way, do you cut back Bergenia?
In general, bergenia plants need little in the way of pruning. You can cut back spent flower stalks to keep plants looking tidy in the summer, but this deadheading will not spur any further blooming. In areas where the foliage is marginally evergreen, trimming back tattered foliage will also increase plant tidiness.
In respect to this, when should I split Bergenia UK?
Every three to four years, bergenia clumps tends to become too dense to produce many flowers, and the center dies out. The ideal time to divide the plant is in the spring, once the flowers have died back. All you have to do is dig them up and separate the root clump into pieces.
Geums can be propagated by: Division - dig up in spring or autumn and break up into separate plants each with roots. Plant out straight away. Discard old weak parts.