0 a glass or plastic box, with a top that can be left open, into which young plants are put for a short time, especially in order to help them grow faster or to protect them from cold weather --
These include various types of row covering techniques such as using cold frames and garden fabric over crops.
The cold frames are made of concrete footings poured below the frost line.
I regret that owing to the continued shortage of softwood it is not possible to relax the existing limitation on supplies of cold frames.
Essentially, a cold frame functions as a miniature greenhouse to extend the growing season.
The seeds can be grown by winter sow in vented containers set up in a cold frame or unheated greenhouse.
Sink pots in winter or store in a cold frame for insulation.
This allowed seeds to be germinated in the greenhouse and then easily moved to the attached cold frame to be hardened-off before final planting outside.
The name itself exemplifies the distinction between the warm greenhouse and the unheated cold frame.
