Genus
Hypsizygus
5 US plant patents have been granted in this genus. 1 is already in the public domain — anyone may propagate and sell it. The next of the 4 still protected comes off patent on January 29, 2028.
Still under patent — 4 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Hokuto-18PP21184Bunashimeji mushroom plant named ‘Hokuto-18’UNDER PATENTJanuary 29, 2028
- marmo shiro-2PP26049Bunashimeji mushroom plant named ‘marmo shiro-2’UNDER PATENTNovember 29, 2033
- Marmo22goPP31279Bunashimeji mushroom named ‘Marmo22go’UNDER PATENTMarch 30, 2038
- HKHM25PP35511Bunashimeji mushroom named ‘HKHM25’UNDER PATENTSeptember 7, 2042
Already in the public domain — 1 cultivar
Most recently freed first. Anyone may propagate and sell this plant — though the name it is sold under may still be a live trademark.
- Hokuto Shiro IchigoukinPP16294Bunashimeji mushroom plant named ‘Hokuto Shiro Ichigoukin’PUBLIC DOMAINAugust 24, 2023
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.