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cold frame

   Also found in: Dictionary/thesaurus, Wikipedia 0.04 sec.
cold frame, in horticulture, sun-heated board frame covered with a removable top of glass or other transparent material and sunk into the ground. The top may be solid or slatted or screened for shade. The cold frame is used to start seedlings in early spring (four to six weeks before the average frost-free date), to harden seedlings or plants removed from greenhouses or hotbeds, and to protect plants during the winter. A hotbed hotbed, low, glass-covered frame structure for starting tender plants. It differs from a cold frame only in that the soil is heated—either artificially as by underground electric wiring or steampipes, or naturally with partially fermented stable manure, which
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 is an artificially heated cold frame.

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The hoop house and cold frame can also be especially useful as the plants grown indoors mature and are ready to be "hardened off.
He figures they have at least 5,000 (``give or take 1,000 or 2,000'') of the unusual plants crowded into their yard, plus a makeshift greenhouse, a seedling ``nursery'' and a cold frame for drought-tolerant plants that can't withstand the rain.
As I write this, I'm looking out my window at a snowy landscape, and remembering planting seeds in my garden's cold frame in short sleeves two days ago.
 
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