Sproutsprite, that cold frame looks great - its polycarbonate (I remembered the name of the type of plastic!) its got the arm fixed to the body so that the lid can be kept open for ventilation, and it doesn't open too far, so hopefully you wouldn't get too many cats climbing in ...
ChanellG, this cold frame would be perfect for my miniature roses! They went dormant and I moved them to the attic but sometimes I worry it's too warm there.
I also really like the idea of using a storage bin as a cold frame. It's an inexpensive solution. Although I must say I'd prefer something like this:
@Claudine, yes, the bell jar cloches are lovely. They are supposed to be ideal for plants like African violets and other "hothouse" types that need more humidity. Of course you also have to lift them occasionally so the plants don't overheat and can get air.
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