cold frame

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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 hotbedhotbed,
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 is mixed with
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 is an artificially heated cold frame.

cold frame

Horticulture an unheated wooden frame with a glass top, used to protect young plants from the cold
References in periodicals archive ?
Coldframes consist of a wooden or concrete block frame with heat supplied by solar radiation through glass or another transparent covering.
You can use them as the walls and door of a compost bin, take them apart and build coldframes from the lumber, or at the very least, use them as firewood, cutting down on your heating expense.
Cover them in compost and keep the tray in a coldframe or unheated greenhouse.
Teena Garay of Homer, Alaska, gets an early start on annuals, perennials, and vegetables by growing seedlings in a coldframe designed and built by her husband, Pete.
All you need to protect sweet peas in winter is a simple makeshift coldframe with a lid.
Place in a greenhouse, coldframe or cold windowsill - germination should take two or three weeks.
Take root cuttings of border phlox, oriental poppies and verbascum and put them into a coldframe or greenhouse.
10 Check on greenhouse heaters, coldframe lights and general safety of electricity supplies in the garden.
CHECK plants in the greenhouse, coldframe, conservatory or porch for greenfly - they are already about, sucking your plants' sap
In milder parts of the intermountain West, start perennials such as delphinium, hellebore, pansy, primula, veronica, and viola in a coldframe or greenhouse for transplanting when at least two sets of true leaves appear.
Having operated one (technically a coldframe, as it is unheated) for years, I'll try to offer some advice based upon my experience.