Plant
Daylily
24 US plant patents name this plant. 16 have expired, so those cultivars are free to propagate and sell. The next of the 8 still protected comes off patent on December 8, 2026.
Still under patent — 8 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Stephanie ReturnsPP18538Daylily plant named ‘Stephanie Returns’UNDER PATENTDecember 8, 2026
- Dynamite ReturnsPP20002Daylily plant named ‘Dynamite Returns’UNDER PATENTNovember 9, 2027
- Mean Mister MustardPP20048Daylily plant named ‘Mean Mister Mustard’UNDER PATENTNovember 13, 2027
- Double Pardon MePP22799Daylily plant named ‘Double Pardon Me’UNDER PATENTSeptember 29, 2030
- Centerton OnePP24129Daylily plant named ‘Centerton One’UNDER PATENTMay 2, 2032
- Happy Days Are Here AgainPP26628Daylily plant named ‘Happy Days Are Here Again’UNDER PATENTDecember 2, 2034
- Happy EnchantmentPP26629Daylily plant named ‘Happy Enchantment’UNDER PATENTDecember 3, 2034
- Blazing ReturnsPP28560Daylily plant named ‘Blazing Returns’UNDER PATENTJuly 12, 2036
Already in the public domain — 16 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.
- Endless HeartPP16515Daylily plant named ‘Endless Heart’PUBLIC DOMAINMay 3, 2025
- Just Plum HappyPP14841Daylily plant named ‘Just Plum Happy’PUBLIC DOMAINSeptember 15, 2023
- Sunset ReturnsPP13465Daylily plant named ‘Sunset Returns’PUBLIC DOMAINSeptember 14, 2021
- When My Sweetheart ReturnsPP13480Daylily plant named ‘When My Sweetheart Returns’PUBLIC DOMAINSeptember 14, 2021
- Romantic ReturnsPP13481Daylily plant named ‘Romantic Returns’PUBLIC DOMAINSeptember 14, 2021
- Red Hot ReturnsPP13499Daylily plant named ‘Red Hot Returns’PUBLIC DOMAINSeptember 14, 2021
- Apricot SparklesPP13223Daylily plant named ‘Apricot Sparkles’PUBLIC DOMAINApril 13, 2021
- Rosy ReturnsPP9779Daylily named `Rosy Returns`PUBLIC DOMAINNovember 6, 2015
- Yellow Silk RufflesPP9372Daylily plant named `Yellow Silk Ruffles`PUBLIC DOMAINDecember 12, 2014
- Pink Silk RufflesPP9380Daylily plant named `Pink Silk Ruffles`PUBLIC DOMAINDecember 12, 2014
- Burgundy LacePP9386Daylily plant named `Burgundy Lace`PUBLIC DOMAINDecember 12, 2014
- X-2PP9387Daylily plant named `X-2`PUBLIC DOMAINDecember 12, 2014
- Fragrant TreasurePP8140Daylily plant named Fragrant TreasurePUBLIC DOMAINAugust 13, 2011
- Black Eyed StellaPP7909Daylily named Black Eyed StellaPUBLIC DOMAINJune 14, 2010
- Aztec YellowPP7409Daylily cultivar named Aztec YellowPUBLIC DOMAINFebruary 14, 2010
- Colonel ScarboroughPP7357Daylily plant named `Colonel Scarborough`PUBLIC DOMAINAugust 8, 2009
Botanically this is Hemerocallis. A patent expiring frees the plant, and its cultivar name with it — cultivar names cannot be trademarked. Any brand name it is sold under is a separate thing and may still be owned.