DUNBAR ARNOLD / AGSTOCKUSA / SCIENCE PHOTO LIBRARY DUNBAR ARNOLD / AGSTOCKUSA / SCIENCE PHOTO LIBRARY
Marijuana plants growing as weeds. Marijuana (Cannabis sativa) is native to central Asia. It is cultivated for three products: fibre from the stems, seed oil, and for use as an intoxicating drug. Its fast-growing nature means that it is a common weed. In good conditions it can grow to over five metres tall with numerous side branches. Cannabis is a banned plant in many countries. Photographed in Colorado, USA.
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