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 ?
Cover them in compost and keep the tray in a coldframe or unheated 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.
If you want long-lasting displays, October sowing beats spring hands down, assuming you have a greenhouse or coldframe.
The trimmings from my holly, and any other shrubs on the rock garden, are quickly turned into cuttings which, once inserted into pots of cutting compost, can be placed in any sheltered outdoor spot or coldframe.
Bucking all recommended gardening advice for her climate in January, Dowling clipped the old plant into 500 cuttings and stuck the cuttings into a coldframe.
We start the seedlings inside and move them to the greenhouse (actually a large coldframe attached to the south wall of the tool shed) when they get about two inches tall.
Take cuttings from border perennials and root them in sandy compost in a coldframe.
KEEP the greenhouse or coldframe well ventilated to minimise hum-idity as this encourages diseases.