Genus
Polygonatum
4 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 3 still protected comes off patent on August 2, 2027.
Still under patent — 3 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Double StuffPP19624Polygonatum plant named ‘Double Stuff’UNDER PATENTAugust 2, 2027
- Angel WingPP21543Polygonatum plant named ‘Angel Wing’UNDER PATENTJuly 1, 2029
- Prince CharmingPP22304Polygonatum plant named ‘Prince Charming’UNDER PATENTSeptember 8, 2030
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.
- Kelli's GoldPP15302Polygonatum plant named ‘Kelli's Gold’PUBLIC DOMAINSeptember 27, 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.