How to winterize large out door pots with decorative shrubs in them.
by
Freda
+8
Apply a thin layer of mulch to protect the roots
https://hortnews.extension.iastate.edu/1995/9-15-1995/winter.html
You don't say where you are located...do you know what planting zone you are in?
You want to avoid water/snow from getting in the pots because as it freezes, it will crack them. Maybe, wrap a trash bag around the trunks, let the bag fall around the pot, seal the seam w/duct tape. I had beautiful pots in RI & they cracked the first year I had them because I left them outside. All we could figure was water/snow expanded in the soil kind of like if you put a bottle of liquid in your freezer. Good luck
You don't say where you are. In Texas, I wrap potted tender perennials with inexpensive blankets, then wrap them in Plankets. Everything has survived ten degrees before.
Interesting ...
I'm in Michigan and I was just researching the same thing. Jdufault51 is right. The best thing to do is wrap them well and bring them out of the weather. Otherwise, the small invisible cracks will expand and crack your containers. I am going to empty my pots and bring them in. You didn't say, but I'm assuming you are talking about ceramic pots. I like your fence line a lot; it's a great idea.