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 ?
Traditionally, resourceful growers have constructed cold frames from scrap materials and used them on farms or in gardens.
As opposed to a greenhouse, a cold frame is cheaper and takes up less room.
Chinese cabbages as well as red and green cabbages and mustards grow well in cold frames.
With the arrival of hot weather, many gardeners take the windows off their cold frames and replace them with shade cloth, a porous plastic sheeting that blocks out part of the light.
And why should they, when they can create their own microclimate in an inexpensive cold frame.
By transplanting your indoor plants into cold frames, you will help them assimilate and prevent excessive shock.
If they're in a propagator over winter they should be ready to plant by spring but those in a cold frame will normally need until autumn before their roots have grown sufficiently.
Move any half-hardy plants from the greenhouse into a cold frame for hardening of f.
Make up a hot bed in a cold frame for early-sown vegetables.
Should keep them under a cold frame until big enough to plant out?
The cold frames are used in conjunction with greenhouses and consist of an aluminum frame with a sloped glass lid which traps heat and encourages plants to grow while protecting them from dew and frost.
Ventilate cold frames and the greenhouse whenever possible to encourage sturdy plant growth.