cold frame

a bottomless, boxlike structure, usually covered with glass or transparent plastic, and the bed of earth that it covers, used to protect plants.

Origin of cold frame

First recorded in 1850–55

The cold-frame also must be aired when the sun shines, and the sashes must be gradually slipped down in mild weather.

Agriculture for Beginners |Charles William Burkett
Transplant the seedlings to the cold-frame and allow them to remain there until May.

ABC of Vegetable Gardening |Eben Eugene Rexford
I have no glass on my place, not even a cold-frame or hot-bed.

A Woman's Hardy Garden |Helena Rutherfurd Ely
After six weeks or two months, the young plants are ready to pot off or to transplant in a cold-frame or cool greenhouse.

Manual of American Grape-Growing |U. P. Hedrick

A cold-frame is like the frame used for a hotbed, but it is placed on well-manured soil in a sheltered spot.

Agriculture for Beginners |Charles William Burkett

cold frame

an unheated wooden frame with a glass top, used to protect young plants from the cold