The cold-frame also must be aired when the sun shines, and the sashes must be gradually slipped down in mild weather.
Their growth can be controlled by proper regulation of the cold-frame sash.
Transplant the seedlings to the cold-frame and allow them to remain there until May.
After six weeks or two months, the young plants are ready to pot off or to transplant in a cold-frame or cool greenhouse.
I have no glass on my place, not even a cold-frame or hot-bed.
A cold-frame is like the frame used for a hotbed, but it is placed on well-manured soil in a sheltered spot.
From seed sown in August grow thrifty young plants that are wintered in a cold-frame.
A hotbed will be of no particular benefit unless supplemented by a cold-frame.