Genus
Tricyrtis
7 US plant patents have been granted in this genus. 4 are already in the public domain — anyone may propagate and sell them. The next of the 3 still protected comes off patent on December 14, 2026.
Still under patent — 3 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Imperial BannerPP18956Tricyrtis plant named ‘Imperial Banner’UNDER PATENTDecember 14, 2026
- White WavesPP20007Tricyrtis plant named ‘White Waves’UNDER PATENTJune 3, 2028
- KristenPP33439Tricyrtis plant named ‘Kristen’UNDER PATENTFebruary 23, 2041
Already in the public domain — 4 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.
- Taipei SilkPP18727Tricyrtis plant named ‘Taipei Silk’PUBLIC DOMAINSeptember 3, 2026
- Raspberry MoussePP16257Tricyrtis plant named ‘Raspberry Mousse’PUBLIC DOMAINJanuary 7, 2025
- Moonlight TreasurePP16037Tricyrtis plant named ‘Moonlight Treasure’PUBLIC DOMAINJuly 20, 2024
- Gilty PleasurePP13688Tricyrtis plant named ‘Gilty Pleasure’PUBLIC DOMAINSeptember 27, 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.