Genus
Iris
4 US plant patents have been granted in this genus. 4 are already in the public domain — anyone may propagate and sell them.
Already in the public domain — 4 cultivars
Most recently freed first. Anyone may propagate and sell these plants — though the name it is sold under may still be a live trademark.
- Mainestream SpringPP16178Iris plant named ‘Mainestream Spring’PUBLIC DOMAINFebruary 10, 2025
- Mainestream TempestPP16097Iris plant named ‘Mainestream Tempest’PUBLIC DOMAINDecember 16, 2024
- ParisPP7223Iris plant named ParisPUBLIC DOMAINApril 10, 2009
- TokyoPP7239Iris plant named TokyoPUBLIC DOMAINApril 10, 2009
A patent expiring frees the plant, and its cultivar name comes with it — cultivar names cannot be trademarked, so they are always free to use. What it does not free is any brand name the plant is marketed under. Those are trademarks and renew indefinitely.