This is a fun project. I made this wreath about 3 years ago. It winters over just fine, although I usually give it a bit of protection during the coldest months. Last winter I put in over a grated wagon on the covered patio. It got moisture from the leaky roof, and was able to drain so as to not get soggy.
There are lots of different succulents you can use but I think my projects always revert to this traditional hens and chicks because the other succulents might not be as hardy. Over the years I continue to trim, groom and nip at the wreath to keep it in shape. I also turn it every month or so in the summer, rotating it so it continues to grow evenly. It’s easy to clip a piece off then tuck it into an empty spot. I cut thin florist wire and bend it into a u-shape (kind of like a bobby pin) to hold the snipping in place.
For the wreath form you’ll need a living wreath frame. It comes in two pieces and will accommodate the wet green moss for the base. You’ll then add the soil, clip on the top half of the wreath and begin your planting.
Here are a couple of examples I saw at Beaverton Farmers Market this spring.
These were made by Sedum Chicks. They have a you-tube video that will help you assemble and plant your own sedum wreath. You have to put up with a couple of minutes of unrelated ads but it’s a pretty good how-to.
A few tips: Make sure the sedums you select are winter hardy for your climate. Your wreath should hang where it will get sunshine for most of the day. Don’t forget to water; I usually just give it a good squirt when I’m watering the pots. Rotate occasionally. Trim when necessary then add the trimmings to empty spots.
Your wreath should last several years. I’ve been trying other containers like wooden boxes. Sedums are pretty forgiving and I’ve always liked that you snip them off and they quickly form new roots. Give sedums a try and let me know how it worked.