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Many growers misunderstand ultraviolet light. They think that it will always hurt their plants. Or, they think that only UV-B is helpful in increasing the medicinal quality of plants. Both those statements are untrue. In this article, we’d like to tell you four reasons you should be growing with UV-A. Before that, though, a reminder on what UV is: What is UV? Atmospheric filtering of UV. UV is electromagnetic radiation just beyond visible light in energy but lower in energy than x-rays. They range from 400 nm to 10 nm (which is a greater wavelength diversity than visible light, ranging from 400...

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