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My greenhouse made of visqueen does not allow the sun to hit soil, causing the growth of algae on the surface. What must be done?
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Greenhouses are generally covered with a clear plastic covering to allow light in for plants to grow. Visqueen is dark and can capture a bit of heat but will not help the plants to grow. I would suggest that you replace the visqueen with a 7mm greenhouse grade clear plastic cover. The other alternative will be to provide a light source inside the green house.
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