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The secret is that they are NOT tropical plants. While they can't take a tremendous amount of chill (USDA Zone 7 or 8, I can't remember which), they do tolerate freezing and snow, and I'm sure they're hardy to at least about 20 degrees.
So, when I tried to winter them in the warm part of my house, they would always die. Tropical plants do fine in those conditions -- my hibiscus blooms all winter, my orchids are happy. Bay trees die in dry, warm conditions. At least they always did for me.
I winter mine in our "family room" which was converted from an attached garage. The south is a glass doorwall. I don't heat it, just leave the door open. Temps range between 40 and 50 all winter. The bay tree goes to the back of the room, where its relatively dark. I water it sparsely during the winter months, just enough to keep it from drying it. Since its cooler out there, its relatively humid compared to the rest of the house.
It does great out there.
One winter, I didn't want to take a bunch of sub-tropical/mild temperate zone plants indoors, so I trenched them -- dug a deep trench below the frost line, put in some straw, laid the plants in, more straw, then boards, the soil and leaves. That worked well. The bay tree looked the same the day I dug it out of the trench as the day I put it in. Some other things were damaged or destroyed by mice, so I didn't try that experiment again, but it did work from the climate perspective.
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