Do it when it needs dividing. I chop mine up when they get too brutal and providing they are watered well (especially in this beautiful warm weather) they seem to do okay. I generally pot up the chunks of plant and give them a little time to recover and grow before planting them out in the garden or in tubs. With a bit of luck you will end up with lots of dark red heucheras.
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Thank you I will lift the monster tomorrow, I do love them they bring such colour to my garden