Thanks for the Protection Tip. I have many, many empty moving boxes that I paid for and don't want to throw out or give up to recycling yet. And they are already flatten with both ends open, ready to use for something like this; Great idea, Shady!

Like the use of leaves and bungee cords.
I did something similar but for different reasons. I was filling a large box (instead of bags) with leaves. I put a few pots in to hold it down and I was amazed how well it insulated the plants. Even after 20 degree weather they were still green!

I have read where others use large plastic bags around the plant filled with leaves. I think it's the leaves' insulating quality working here. Unless, like one of my boxes, it blows over on Friday night! I even placed rocks on top because it was so windy. It looks like 2 large cordyline/Ti Plants will have to start growing all over again.

Great Idea, thanks.
To help the box not get blown over by wind, open the bottom flaps and lay them flat on the ground, poke a few holes and insert Landscape Fabric Pins, either plastic or metal through the flap and into the ground. It's not a perfect solution, but it helps until the winds get too strong.

And, after the box is a bit worn out, put it down on an area where you want to start a new planting bed. Put some Mulch on top of it. Will kill what is growing under it & turn to mulch itself.

I also save the plastic "pillows" (that come as fill in packages) to fill in around plants.

too late. my sansevieras are already dead.