Genus
Fraxinus
9 US plant patents have been granted in this genus. 9 are already in the public domain — anyone may propagate and sell them.
Already in the public domain — 9 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.
- HeuverPP13262Hardy green ash tree named ‘Heuver’PUBLIC DOMAINMay 26, 2020
- Northern GemPP11777Hybrid ash tree named ‘Northern Gem’PUBLIC DOMAINJanuary 20, 2019
- Northern TreasurePP11840Hybrid ash tree named ‘Northern Treasure’PUBLIC DOMAINJanuary 20, 2019
- CimmzamPP8077Green ash tree named CimmzamPUBLIC DOMAINJanuary 10, 2011
- WaskyPP7036Green ash named `Wasky`PUBLIC DOMAINMarch 7, 2008
- UrbanitePP6215Green ash named UrbanitePUBLIC DOMAINJanuary 17, 2006
- Bergeson NurseryPP4904Green ash treePUBLIC DOMAINJune 20, 2000
- White ashPP4756PUBLIC DOMAINApril 14, 2000
- Green AshPP4684Green Ash treePUBLIC DOMAINApril 27, 1999
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.