Genus
Corydalis
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 February 3, 2027.
On the name: Filed as Corydalis. GBIF marks this name's backbone entry as unresolved; the genus itself is not in dispute.
Still under patent — 4 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Canary FeathersPP18909Corydalis plant named ‘Canary Feathers ’UNDER PATENTFebruary 3, 2027
- Berry ExcitingPP18917Corydalis plant named ‘Berry Exciting’UNDER PATENTMarch 18, 2027
- COURIBLUEPP25277Corydalis plant named ‘COURIBLUE’UNDER PATENTJuly 9, 2033
- Porcelain BluePP31637Corydalis plant named ‘Porcelain Blue’UNDER PATENTJanuary 23, 2039
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.
- Golden PandaPP13254Corydalis flexuosa plant named ‘Golden Panda’PUBLIC DOMAINMay 3, 2021
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.