cold frame

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

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cold frame
 
n
an unheated wooden frame with a glass top, used to protect young plants from the cold

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To avoid an outbreak, it is best to keep the cold frame as dry and warm as
  possible, without inhibiting plant growth.
With adequate moisture seed can also be planted outdoors spring through early
  summer, or in a cold frame late summer through fall.
Seeds are best sown in a cold frame, for natural stratification, as soon as
  they are ripe.
If seed are sown in a cold frame immediately after autumn ripening,
  stratification is said to produce a more even germination.
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