Genus
Primula
27 US plant patents have been granted in this genus. 8 are already in the public domain — anyone may propagate and sell them. The next of the 19 still protected comes off patent on January 17, 2028.
Still under patent — 19 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- ThirtyonePP20220Primula plant named ‘Thirtyone’UNDER PATENTJanuary 17, 2028
- K 74PP22674Primula plant named ‘K 74’UNDER PATENTMarch 10, 2031
- K 72PP22711Primula plant named ‘K 72’UNDER PATENTMarch 10, 2031
- KERBELREDPP24691Primula plant named ‘KERBELRED’UNDER PATENTOctober 11, 2032
- K22PP24356Primula plant named ‘K22’UNDER PATENTOctober 17, 2032
- HAK-P-01PP26163Primula plant named ‘HAK-P-01’UNDER PATENTJune 1, 2034
- HAK-P-02PP26188Primula plant named ‘HAK-P-02’UNDER PATENTJune 8, 2034
- KERBELGOLDIEPP31143Primula vulgaris ‘KERBELGOLDIE’UNDER PATENTAugust 7, 2038
- KERBELCARMENPP31225Primula vulgaris ‘KERBELCARMEN’UNDER PATENTAugust 7, 2038
- KERBELBLICPP32385Primula plant named ‘KERBELBLIC’UNDER PATENTAugust 27, 2039
- KERPOLILAPP34257Primula plant named ‘KERPOLILA’UNDER PATENTAugust 16, 2041
- KERPOLSOPINPP34258Primula plant named ‘KERPOLSOPIN’UNDER PATENTAugust 16, 2041
- IFPROBPP34900Primula plant named ‘IFPROB’UNDER PATENTJuly 27, 2042
- KERBELRIPPP36020Primula plant named ‘KERBELRIP’UNDER PATENTAugust 21, 2043
- KERANNAWITPP36037Primula plant named ‘KERANNAWIT’UNDER PATENTAugust 21, 2043
- KerannasunPP36225Primula plant named ‘Kerannasun’UNDER PATENTAugust 21, 2043
- KERANNAWEAVEPP36684Primula plant named ‘KERANNAWEAVE’UNDER PATENTAugust 9, 2044
- KERBELBLUWATPP36803Primula plant named ‘KERBELBLUWAT’UNDER PATENTAugust 9, 2044
- KERBELROSAPP36833Primula plant named ‘KERBELROSA’UNDER PATENTAugust 9, 2044
Already in the public domain — 8 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.
- KerbelmilkPP17716Primula plant named ‘Kerbelmilk’PUBLIC DOMAINOctober 3, 2025
- KerbelpicePP16598Primula plant named ‘Kerbelpice’PUBLIC DOMAINMay 29, 2025
- KerbelcobPP16397Primula plant named ‘Kerbelcob’PUBLIC DOMAINMarch 27, 2025
- KerbelbutPP16373Primula plant named ‘Kerbelbut’PUBLIC DOMAINMarch 20, 2025
- KerbelnecPP16365Primula plant named ‘Kerbelnec’PUBLIC DOMAINMarch 18, 2025
- KerbelcremPP16205Primula plant named ‘Kerbelcrem’PUBLIC DOMAINJanuary 28, 2025
- PrinicPP12892Primula plant named ‘Prinic’PUBLIC DOMAINApril 6, 2021
- YvonnePP10099Plant variety of Primula named `Yvonne`PUBLIC DOMAINJune 10, 2016
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.