From this one plant I have made many more. I trim a bit off in the spring and put the tips in moist soil, sometimes with rooting hormone but not always. The trick is keeping the soil moist until it roots. These are all from that original plant. They're at the bottom of my driveway where they get less water and usually are shorter. Because of overhanging trees they get less sun so sparser flowers, but they fill out a difficult area and look good. I'm having some luck with other sedums around my yard, but Autumn Joy seems the strongest so far. That's probably why it became common.

Mary, First I would say relax you really can't do any harm to these guys. I have divided them by simply taking my shovel and cutting them in half right in place not disturbing the one half. I have also dug the entire clump up and cut the plant in half with a saw, replanting one half. I have also dug up and potted pieces of plant material for a swap forgot them under a shrub and re-discovered them three years later still happily growing and ready for this years swap. If your clumps are very large make certain your shovel has a sharp edge as it will be difficult to cut through. What other plants are you growing with your sedum?

Susanka, If it really looks like they're going to die, do any of the stems seem to be in good enough shape yet that you could make some cuttings to start some new ones? I recommend making some tip cutings, and some stem cuttings. I've had trouble rooting tip cuttings from the upright sedums, and I'm thinking the stem cuttings might do better--but I'm not positive about that! The other possibility would be to dig them up and put the best looking rooted pieces into pots to get them going again. That way you can control the water---and be sure there aren't any critters getting at them! Good luck, Skybird

Never stop learning about plants, looking for plants or living around plants. It has many rewards. tj