Ideas for overwintering?

Desert Rat

Yamadori
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I'd like to take better care of my tropicals this upcoming winter than I have in previous years. Some trees have been brought inside the house, some stayed outside unprotected, and some were moved up under the covered patio. I did lose all of my Bougainvillea last year, to a few nights of 28 degrees. My larger "pre-bonsai" (patio trees in gigantic pots) seemed to weather the cold well enough, but the smaller potted Ficus were lost.

I have two things going for my winters here in Phoenix: warm daytime temperatures (highs in the high 60's to low 70's), and an un-heated south-facing garage that stays anywhere from 75-80 degrees throughout the night.

What would be my best plan of attack? I've thought of three things: 1) Moving the plants in every night after work to the unheated garage, and back out before work in the morning. 2) Building a rack in the garage, illuminated with daylight LED's. 3) Setting up a PVC and plastic sheeting greenhouse with a propane heater. Here's my foreseeable problems: with setup #1, I have to set them out before sunrise, which can be close to the night time low. #2, the daylight LED's may not be bright enough (for a reasonable expense). #3, open flames.

I know that the best solution is to grow plants that survive all the seasons easily. However, tropicals grow extremely well here in the summer. Very fast and very aggressive.
 

rockm

Spuds Moyogi
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The Phoenix Bonsai Society probably has this nailed. I'd ask around at some of the resources they've listed
http://www.phoenixbonsai.com/
Your climate is very different from what the vast majority of us here have. We can make guesses, but they might not be very helpful or accurate.

This might be a place to start, has list of cold hardiness temps by species, as well as covering some of the physics involved -- for instance, yes you can get frost without the air temperature dropping to 32 (can happen more often than you think in the desert because of the dry air --BTW, I used to live in Phoenix way back when):
http://www.phoenixtropicals.com/frostDamage.html
http://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1002.pdf

The second link nixes your plastic sheeting idea. Plastic is a very bad covering for plants in cold weather. Burlap or blankets, or even simple wet newspaper works better.
 
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