DAVE REEDE / AGSTOCKUSA / SCIENCE PHOTO LIBRARY DAVE REEDE / AGSTOCKUSA / SCIENCE PHOTO LIBRARY
Hemp plants (Cannabis sativa) at mid-growth stage. They are being grown for their fibres, which are used to make paper and textiles. The waste products of this process can be used to make lower grade paper, and hemp seeds are a source of oil for varnishes, cosmetics and lubricants. The leaves and flowering heads of hemp, known as marijuana, contain the psychoactive drug delta-9- tetrahydrocannabinol (THC). For this reason, hemp production is strictly controlled. Industrial hemp contains much less THC than hemp grown illegally for marijuana, and has little effect as a drug. Photographed in Manitoba, Canada.
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