Tee ~ do you think your Agave may sucker and put up new plantlets as a means of survival? Hope so, unless you don't care for it much.
Bev ~ I chuckled at the visual image of you out there changing the wet sheets and doing laundry for the plants. Something only a gardener would do... or understand!
Tarev ~ that is a good thought on a smaller container drying out faster. I would have only thought of using a fast draining growing media.
And you mentioned
I think the damaged parts somehow seals off further damage to the plant in some way
and in my experience, I believe you are entirely correct. I will take it a step further. I have found on some of my Stapeliads, that when the stems are damaged I leave them on the plant to harden and dry totally. When it has cured, you can easily twist it off the plant. If there is resistance, I leave it on. That allows the stem under the damaged foliage to dry and seal itself off. In this manner, it prevents rotting or disease.
Thanks for showing those photos.
That reminds me of a couple plants I left out last winter in this bed. They aren't truly succulent but tender. Euphorbia ~ Crown of Thorns. They had grown huge. I was amazed to see the red bloomer was more frost hardy and the yellow was more sensitive. And even more surprised to see it acted like pruning by sealing the stems and then when the growth season began, it sprouted back out. I'll see if I can find those pictures.
I think a lot of succulents are tolerant as long as the roots haven't been damaged by freezing. In small pots, how do you keep that from happening?
I have been searching through my saved links looking for lists of cold hardy succulent plants. Has anyone seen anything like that?