How seed went from public property to patented product
For millennia seed was a commons that farmers saved and shared. Across the 20th century, three laws and two Supreme Court rulings turned living plants into private, patented property.
This is the founding spoke of the hub: the legal machinery of enclosure, graded step by step, and the consolidation that left the proprietary market in a few corporate hands. We keep the market-share claim honest — the real numbers are damning enough without the oversold version.
What this page is about
Seed used to be a commons. Over four legal steps — the Plant Patent Act of 1930, the Plant Variety Protection Act of 1970, the Supreme Court’s 1980 ruling that living organisms can be patented, and its 2013 ruling that farmers cannot save patented seed — it became private, patented property. In parallel the industry consolidated from six major firms to four.
Each of those steps is a matter of statute or Supreme Court record, graded FACT. The one number we hold back on is “95% of seed is corporate owned”: that blanket overstates it, so we give the honest, crop-specific figures instead.
The same investigation, restaged one beat at a time. Step through it here, or present it fullscreen.
How seed went from public property to patented product.
For millennia seed was a commons farmers saved and shared. Across the 20th century, three laws and two Supreme Court rulings turned living plants into private, patented property.
The record, in order
Every dated event on this page, assembled chronologically. The page may cover events in a different order for the narrative; this is the straight timeline.
- 1930Plant Patent Act of 1930 — the first crack in the commons
- 1970Plant Variety Protection Act of 1970 — extending control to seed crops
- 1980Diamond v. Chakrabarty (1980) — the Supreme Court says life can be patented
- 2013Bowman v. Monsanto (2013) — farmers cannot save patented seed
- 2018Consolidation — six firms became four
Four legal steps, one enclosure
Plant Patent Act of 1930 — the first crack in the commons
FACTThe Plant Patent Act of 1930 allowed, for the first time in U.S. law, patents on distinct and new varieties of asexually reproduced plants — those propagated from cuttings, grafts, and the like, such as fruit trees and ornamentals. It was the first legal break from the long tradition that plants were unpatentable, a product of nature belonging to no one. It carved a narrow exception; the century that followed widened it steadily.
Plant Variety Protection Act of 1970 — extending control to seed crops
FACTThe Plant Variety Protection Act of 1970 extended intellectual-property protection to sexually reproduced, seed-grown crop varieties, giving breeders exclusive marketing rights. Crucially, it preserved a limited farmer exemption allowing growers to save seed from a protected variety for their own use — an exemption that later utility-patent regimes would effectively erase for genetically engineered lines.
Diamond v. Chakrabarty (1980) — the Supreme Court says life can be patented
FACTIn Diamond v. Chakrabarty, the Supreme Court held 5-4 that a live, human-made micro-organism — a bacterium engineered to break down oil — is patentable subject matter under the Patent Act, reasoning that the relevant distinction is not living versus inanimate but nature's handiwork versus human invention. It was the ruling that opened the door to patenting living things, and courts and the patent office soon extended it to genetically engineered plants and the seed that carries them.
Bowman v. Monsanto (2013) — farmers cannot save patented seed
FACTVernon Bowman, an Indiana farmer, bought commodity soybeans from a grain elevator and planted them, reasoning that once a patented seed is sold the patent is 'exhausted.' A unanimous Supreme Court disagreed: the patent-exhaustion doctrine does not permit a farmer to make new copies of a patented seed by planting and harvesting it without the patent holder's permission. The ruling cemented, at the highest level, that saving and replanting patented seed is infringement — reversing thousands of years of practice for the crops that matter most.
Consolidation — six firms became four
FACTAs the law made seed ownable, the industry bought itself up. A wave of mega-mergers around 2017-2018 condensed six dominant agrochemical-and-seed firms into four: Bayer (which acquired Monsanto), Corteva (spun out of the Dow-DuPont merger), Syngenta (acquired by the Chinese state-owned ChemChina), and BASF. Together they control the majority of the global proprietary seed and trait market. The largest of them, Bayer, is itself a direct descendant of the IG Farben chemical cartel — a thread this hub follows into the companies' criminal histories.
Whoever owns the seed owns the food
Seed is the first link in the food chain, and for most of history it belonged to everyone. The enclosure documented here handed that first link to a few corporations and bound it to their patented chemicals, a bundle this hub traces from the pesticide immunity playbook to the antitrust cases and the companies’ own criminal records. The law did not have to go this way — the 1930 Act carved a narrow exception, and the 1970 Act kept a farmer’s right to save seed. Step by step, the exception became the rule. That is the pattern the Agrochemical Cartel hub documents: a public good converted into private property, and defended by every tool the owners could buy.
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