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Old 10-21-2018, 05:52 PM   #32 (permalink)
SoCal2warm
 
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Default Re: Greenhouse bananas

In the Pacific Northwest, zone 8a
I bought a cheap vinyl circular greenhouse tent, about 8 feet in diameter, that would be really good for growing a banana in-ground.
Put a 55 gallon water barrel in there and made some temperature measurements.

5:30-6pm
54 inside (F)
43 outside

1:00-1:30am (night)
50 inside
46 outside

3:30pm partly cloudy
67 inside
55 outside

The water barrel was very cool to the touch, but just above the water line the barrel was warm.

Unfortunately there's a tree blocking some of the sunlight on half the greenhouse tent during the evening, so that's probably keeping the temperature down lower than it would otherwise be.
I'm also planning to put some mylar sheeting against the back side of the greenhouse tent to help reduce heat loss during the night. Due to the latitude and winter season the sun is at a low angle in the sky, so there's not really sunlight coming in through the back side.
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