Taken from, "Mother Earth News" magazine. There ARE different colors with different uses/ results. In a nutshell:
Black - controls weeds & warms the soil Brown - works like black mulch Red - reflects far-red rays from sunlight back onto plants Green - improves performance w/ certain veggies in cool summers Silver - confuses certain bugs White - controls weeds Clear - warms the soil
I tried that red film - is that what you're referring too? I really didn't notice any difference between the tomatoes grown with it and the ones without. It helps with the weeds though but I prefer the ground cloth that lets in air and water.
I don't know about aluminum foil but I read that strips of copper around plants creates a slug barrier!
I know that tobacco farmers sometimes used it early in the season to warm things up a bit in Ohio where I used to live... but out here I would not use it. I have too many problems with sunburn and needing to shade things.
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