The plants that heal and the plants that kill are frequently the same plant. The dose is the only distinction. Nightshade, hemlock, foxglove, monkshood — the witch's garden is the pharmacist's garden. Only the intention differs.
The Datura has opened. Do not touch. Do not breathe deeply near it. Record the flower diameter and seal the greenhouse.
The nightshade family is a gallery of contradictions. Tomato. Potato. Pepper. Tobacco. Belladonna. Mandrake. Henbane. All the same family. The domesticated vegetables and the witches' herbs grew from the same ancestor.
Atropine — the active alkaloid in belladonna — dilates the pupils. Renaissance Italian women dripped it into their eyes to appear more alluring. Hence belladonna: "beautiful woman." The poison was a cosmetic. The cosmetic was a poison.
Today, atropine is used in cardiac emergencies and eye examinations. The same molecule, the same effect. The intention has changed. The plant has not.
Medieval herbalists followed the Doctrine of Signatures: a plant's shape reveals its cure. Walnuts, resembling brains, cure head ailments. Liverwort, with liver-shaped leaves, treats the liver. Lungwort, for lungs.
The doctrine was wrong. And yet, compelled by it, herbalists observed plants with extraordinary attention. Their notebooks — the herbals — recorded everything: color, smell, habitat, season, growth pattern.
Some of what they found was useful. Foxglove for heart failure: wrong doctrine, correct cure. The observation preceded the biochemistry by four hundred years.
Socrates' cup. The execution drug of Athens. Paralysis ascending from the feet. The mind remains clear. This is philosophy's plant.
Seven thousand years of cultivation. Pain relief. Addiction. Morphine. Codeine. War. Trade. Empire. The history of the world is partly the history of this flower.
Not a plant. A fungus on rye. The Salem witch trials: ergot poisoning hypothesis. LSD was derived from ergotamine. A medieval plague became a psychedelic.
The root resembles a human form. Medieval lore: it screams when pulled. Anaesthetic, sedative, hallucinogen. Harry Potter notwithstanding, the root is real and genuinely strange.