Genus
Tiarella
41 US plant patents have been granted in this genus. 24 are already in the public domain — anyone may propagate and sell them. The next of the 17 still protected comes off patent on September 5, 2028.
Still under patent — 17 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Mystic MistPP21282Tiarella plant named ‘Mystic Mist’UNDER PATENTSeptember 5, 2028
- SusquehannaPP21961Tiarella plant named ‘Susquehanna’UNDER PATENTNovember 2, 2029
- OctoraroPP21962Tiarella plant named ‘Octoraro’UNDER PATENTNovember 2, 2029
- WissahickonPP21963Tiarella plant named ‘Wissahickon’UNDER PATENTNovember 2, 2029
- DelawarePP21980Tiarella plant named ‘Delaware’UNDER PATENTNovember 2, 2029
- LehighPP22031Tiarella plant named ‘Lehigh’UNDER PATENTNovember 2, 2029
- Cascade CreeperPP21925Tiarella plant named ‘Cascade Creeper’UNDER PATENTDecember 26, 2029
- Happy TrailsPP21933Tiarella plant named ‘Happy Trails’UNDER PATENTJanuary 2, 2030
- Stephanie CohenPP22258Tiarella plant named ‘Stephanie Cohen’UNDER PATENTAugust 18, 2030
- Oregon TrailPP22712Tiarella plant named ‘Oregon Trail’UNDER PATENTNovember 24, 2030
- Appalachian TrailPP22675Tiarella plant named ‘Appalachian Trail’UNDER PATENTNovember 26, 2030
- Sunset RidgePP23628Tiarella plant named ‘Sunset Ridge’UNDER PATENTDecember 23, 2031
- Pacific CrestPP23591Tiarella plant named ‘Pacific Crest’UNDER PATENTDecember 26, 2031
- Jade PeacockPP26730Tiarella plant named ‘Jade Peacock’UNDER PATENTAugust 30, 2034
- FingerpaintPP28012Tiarella plant named ‘Fingerpaint’UNDER PATENTMarch 10, 2036
- GOWINGPP29464Tiarella plant named ‘GOWING’UNDER PATENTJuly 25, 2036
- Cutting EdgePP29745Tiarella plant named ‘Cutting Edge’UNDER PATENTFebruary 7, 2038
Already in the public domain — 24 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.
- Morning StarPP17486Tiarella plant named ‘Morning Star’PUBLIC DOMAINSeptember 3, 2025
- TNTIA041PP16734Tiarella plant named ‘TNTIA041’PUBLIC DOMAINJune 11, 2025
- Sugar and SpicePP16738Tiarella plant named ‘Sugar and Spice’PUBLIC DOMAINJune 10, 2025
- Candy StriperPP15528Tiarella plant named ‘Candy Striper’PUBLIC DOMAINMay 22, 2024
- Running TigerPP15360Tiarella plant named ‘Running Tiger’PUBLIC DOMAINFebruary 10, 2024
- Pirate's PatchPP14907Tiarella plant named ‘Pirate's Patch’PUBLIC DOMAINOctober 19, 2023
- Black SnowflakePP13684Tiarella plant named ‘Black Snowflake’PUBLIC DOMAINFebruary 19, 2022
- SeafoamPP13696Tiarella plant named ‘Seafoam’PUBLIC DOMAINFebruary 19, 2022
- Butterfly WingsPP13629Tiarella plant named ‘Butterfly Wings’PUBLIC DOMAINDecember 8, 2021
- Pink SkyrocketPP13382Tiarella plant named ‘Pink Skyrocket’PUBLIC DOMAINNovember 20, 2021
- Pink BrushesPP13329Tiarella plant named ‘Pink Brushes’PUBLIC DOMAINSeptember 30, 2021
- Pink PearlsPP13445Tiarella plant named ‘Pink Pearls’PUBLIC DOMAINSeptember 30, 2021
- StarfishPP13148Tiarella plant named ‘Starfish’PUBLIC DOMAINJuly 9, 2021
- Jeepers CreepersPP13437Tiarella plant named ‘Jeepers Creepers’PUBLIC DOMAINJune 28, 2021
- Neon LightsPP13289Tiarella plant named ‘Neon Lights’PUBLIC DOMAINJune 27, 2021
- SpringwoodPP14087Tiarella plant named ‘Springwood’PUBLIC DOMAINJune 8, 2021
- Crow FeatherPP12335Tiarella plant named ‘Crow Feather’PUBLIC DOMAINJuly 12, 2020
- Iron ButterflyPP12396Tiarella plant named ‘Iron Butterfly’PUBLIC DOMAINJune 2, 2019
- Spring SymphonyPP12397Tiarella plant named ‘Spring Symphony’PUBLIC DOMAINJune 2, 2019
- Black VelvetPP12348Tiarella plant named ‘Black Velvet’PUBLIC DOMAINApril 8, 2019
- Mint ChocolatePP11379Tiarella plant named `Mint Chocolate`PUBLIC DOMAINJuly 22, 2018
- Spanish CrossPP11345Tiarella plant named `Spanish Cross`PUBLIC DOMAINMay 5, 2018
- CygnetPP11051Tiarella plant named `Cygnet`PUBLIC DOMAINJanuary 6, 2018
- NinjaPP11168Tiarella plant named `Ninja`PUBLIC DOMAINDecember 1, 2017
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.