My high school biology said plants need sun and water to grow. I laid down heavy-duty fabric in my backyard and covered that with mulch. Somehow, weeds still managed to burst through the fabric, flourish and grow.
A secondary question to this would be: Are there any plants I could put in my bathroom, that has zero natural light, that would stay healthy and grow?
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Seeds contain a reserve of nutrients to allow the plant to grow enough to reach the surface and sprout leaves.
Also, many “weed” plants have large nutrient reserves in their root systems, so if you chop them off but leave the roots, they can grow back without sunlight.
Neither of these strategies works long term, but in the short term, plants can still grow for a while without sunlight.
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