Plants use mostly visible light. Not all wavelengths of light can support photosynthesis. Absorbance of light by plants peaks in the violet-blue and red range (between 400 and 700 nm): Compare the spectrum of UV light (100 to 400 nm). read more
How to Grow an Oak Tree from an Acorn. It's hard to imagine that a mighty oak tree can come from a tiny acorn, but with enough patience, you can grow one yourself! read more