The heavy metals taken up by cannabis plants grown in coal mining remediation fields were expressed in the leaves of the mature plants. But, critically, the heavy metals did not appear in the floral buds where cannabinoids, including valuable CBD, is concentrated, the researchers told Leafly.

The cannabis sativa plant produces more cannabinoids when stressed. That’s a fact long known to growers seeking higher levels of THC and CBD.

Stressing plants also comes with risk. 

Stressed plants have a tendency to turn hermaphrodite—producing seeds and pollen rather than buds laden with cannabinoids.

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Chris Roberts ~ Leafly.com ~