The experiment asked the question “will the grasses continue to grow after the frost(s) set in? And the answer was, yes! Why? The specific heat (SH) of soil. SH is a property: resisting T change. Water has a very high SH (ever swim in the ocean on the east coast in November, when its snowing on Thanksgiving day? I have! The water was nice n warm!) Contrast that with the air (very low SH (changes T readily). For the nerds: SH explained further http://www.calpoly.edu/~gthorncr/ME302/documents/csubv.pdf
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