A solar heat accumulating greenhouse has a heat accumulating tank (5B) buried in the ground within the greenhouse, an air discharge pipe (504) open towards the lower portion in the greenhouse and an air suction pipe (505) open towards the upper portion of the greenhouse having an air circulating fan (506) on the way. A large number of air blast pipes (521) extending through a cover (502) of heat conducting material are buried in the ground. Since the plant culture soil is thereby heated simultaneously with the air within the greenhouse, growth of plants is expedited.
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