Oh my goodness, your seedum ball is beautiful. I'm so glad I followed the link.

I'm a few zones warmer than you, but I've overwintered hardy perennials for many years in containers by moving them against a wall, stuffing bags of leaves around them, and tipping them sideways so water won't collect in them and freeze.
I've overwintered daylilies tons), jacob's ladder (variegated- great foliage), hardy hibiscus, veronica (speedwell), potentilla, "monarch's velvet", etc.
Hope that helps.
That Is a great Sedum ball!
Wish I was your neighbor lol ;)

I have to admire your tenacity at continuing to container garden in a 3/4 zone !! Wow, I thought it was hard in zone 5b. :)

However, when we leave everything here for the winter and go south, it is always the chives which survive, and they were first planted three years ago. I just set the pot against the south side of our garden shed, sort of tipped sideways. I also set the pot into another slightly larger pot and use a little bit of paper around it. My document shredder comes in very handy for creating such mulch.

Trying to keep container plants indoors where there are cats can be challenging, even with hanging baskets. If you have a basement room where you can shut the door against their incursion, that might help somewhat. I'm basically a zone 8B gardener, a real beginner in colder climate gardening, so your zone gardening is awesome to me.

Hey, I'm a real northerner. I lived for years in zone 1b so zone 3/4 is a huge treat for me. I would love to try to garden in even warmer climes but think it would be like learning a whole new language!