Genus

Grifola

3 US plant patents have been granted in this genus. 0 are already in the public domain — anyone may propagate and sell them. The next of the 3 still protected comes off patent on June 15, 2033.

Still under patent — 3 cultivars

Soonest to come off patent first. You may not propagate these for sale until the date shown.

Grifon-7PP25856Maitake mushroom named ‘Grifon-7’UNDER PATENTJune 15, 2033
Grifon-8goPP33127Maitake mushroom named ‘Grifon-8go’UNDER PATENTSeptember 23, 2039
YUKIGUNIMAI 14GOPP35254Maitake mushroom named ‘YUKIGUNIMAI 14GO’UNDER PATENTFebruary 28, 2042

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.