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I've wondered about this for a while- since the sun in our hemisphere is to the south in the winter, does the north side of a GH need to be transparent? If the north wall is vertical, it would not shade the plants. Also, would a reflective surface on the north side have a positive effect on the plants? I would agree with some others that 55-gallon barrells do not seem to absorb much heat and warm the GH at night. We shall try milk jugs painted black. Do 5-gallon buckets need to have lids on them to work best?
Thanks in advance,
David
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