I have reworked my greenhouse plans a bit to better secure the grow beds and prevent them from collapsing at some point.
I decided to put raised grow beds perpendicular to the first long one. This helps support the main bed. The ground is sloped in the garden so the raised beds will lean and possibly fall with time. If I had two long parallel grow beds when I would have to support both of them and that would be a problem.
Also by modifying my plan like this I have more sunlight reaching all plants during all parts of the day. The open wall faces due south.
I now have three outer walls of the greenhouse insulated by raised 40 inch tall grow beds by 2 feet thick. This will act as a thermal mass, heating up during the day and radiating heat into the greenhouse during the night.
With the outer walls now insulated I do not need such high raised beds in the center of the greenhouse. So I am building two 4 ft x 6 ft x 13 inch tall grow beds in the middle.
This uses less material to fill the beds as well.
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