Genus
Amsonia
4 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 4 still protected comes off patent on January 15, 2040.
Still under patent — 4 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- StarstruckPP32246Amsonia plant named ‘Starstruck’UNDER PATENTJanuary 15, 2040
- Verdant VenturePP33415Amsonia plant named ‘Verdant Venture’UNDER PATENTDecember 15, 2040
- String TheoryPP34419Amsonia plant named ‘String Theory’UNDER PATENTNovember 29, 2041
- Blue BehemothPP35930Amsonia plant named ‘Blue Behemoth’UNDER PATENTSeptember 28, 2043
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.