Assuming the roots have gone. Give a good dig over. Well rotted manure if any. Or empty a mature compost bunker if you have one handy. Let it rest while you gather your collection, if not already ammassed and plan how to arrange them. Then follow the planting instructions for the Heuchera.

Lots of good compost, Maybe also some blood meal, bone meal, and seaweed. I'd put on some Epsom salts, too. Lime might be necessary in your area, too. They impoverish the soil badly.

Snap, Dorjac!

Many thanks for your swift answer

Bear in mind they won't grow as tall, so be prepared for the neighours peering over your hechera hedge! Okay, I was being silly! Phil J