How to prepare sedum for winter?
Here's what you need to do to make sure your plant thrives: find a well-draining soil mix, and give the soil around it a little mulch. In climates where it gets very cold, you'll want to protect your plant by either leaving some of the older leaves on the plant or cutting them down before a hard freeze.
Just make sure the soil where you plant your sedum can drain well, and you won't have to worry about root rot during those wet winters.
To help your sedum get ready for winter, make sure it's planted in soil that allows water to drain easily. If you live in an area with harsh winters, a thin layer of mulch around the base can help protect it. Depending on the type of sedum you have, you might want to either leave the old leaves on the plant or trim them before the first frost.