Plant
Clematis
220 US plant patents name this plant. 61 have expired, so those cultivars are free to propagate and sell. The next of the 159 still protected comes off patent on October 19, 2026.
Still under patent — 159 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Stolwijk GoldPP18648Clematis plant named ‘Stolwijk Gold’UNDER PATENTOctober 19, 2026
- Snow BellsPP19220Clematis plant named ‘Snow Bells’UNDER PATENTMay 23, 2027
- American BeautyPP19627Clematis plant named ‘American Beauty’UNDER PATENTJune 16, 2027
- Evipo039PP20638Clematis plant named ‘Evipo039’UNDER PATENTJanuary 25, 2028
- ZodaquePP20330Clematis plant named ‘Zodaque’UNDER PATENTAugust 8, 2028
- ZojapurPP20343Clematis plant named ‘Zojapur’UNDER PATENTAugust 8, 2028
- ZoklakoPP20362Clematis plant named ‘Zoklako’UNDER PATENTAugust 8, 2028
- ZostiwaPP20372Clematis plant named ‘Zostiwa’UNDER PATENTAugust 8, 2028
- RobloMPP21203Clematis plant named ‘RobloM’UNDER PATENTJanuary 8, 2029
- Evipo016PP21583Clematis plant named ‘Evipo016’UNDER PATENTApril 6, 2029
- JenmarPP21713Clematis plant named ‘Jenmar’UNDER PATENTSeptember 8, 2029
- DoramiPP21740Clematis plant named ‘Dorami’UNDER PATENTSeptember 8, 2029
- Cleminov 29PP22365Clematis plant named ‘Cleminov 29’UNDER PATENTAugust 3, 2030
- FestivalPP22817Clematis plant named ‘Festival’UNDER PATENTSeptember 14, 2030
- Andrew VanLaekenPP22829Clematis plant named ‘Andrew VanLaeken’UNDER PATENTSeptember 14, 2030
- ZofofriPP22608Clematis plant named ‘Zofofri’UNDER PATENTSeptember 28, 2030
- ZodakiPP22651Clematis plant named ‘Zodaki’UNDER PATENTSeptember 28, 2030
- UNAI 005PP22652Clematis plant named ‘UNAI 005’UNDER PATENTNovember 12, 2030
- UNAI 004PP22677Clematis plant named ‘UNAI 004’UNDER PATENTNovember 12, 2030
- UNAI 007PP22678Clematis plant named ‘UNAI 007’UNDER PATENTNovember 12, 2030
- UNAI 002PP22679Clematis plant named ‘UNAI 002’UNDER PATENTNovember 12, 2030
- UNAI 006PP22901Clematis plant named ‘UNAI 006’UNDER PATENTNovember 12, 2030
- UNAI 008PP22902Clematis plant named ‘UNAI 008’UNDER PATENTNovember 12, 2030
- UNAI 001PP22903Clematis plant named ‘UNAI 001’UNDER PATENTNovember 12, 2030
- UNAI 003PP22922Clematis plant named ‘UNAI 003’UNDER PATENTNovember 12, 2030
- UNAI 009PP22899Clematis plant named ‘UNAI 009’UNDER PATENTFebruary 17, 2031
- UNAI 011PP22900Clematis plant named ‘UNAI 011’UNDER PATENTFebruary 17, 2031
- UNAI 010PP22921Clematis plant named ‘UNAI 010’UNDER PATENTFebruary 17, 2031
- Beautiful BridePP23292Clematis plant named ‘Beautiful Bride’UNDER PATENTApril 23, 2031
- ZoangPP23248Clematis plant named ‘Zoang’UNDER PATENTMay 7, 2031
- YAKU010APP23887Clematis plant named ‘YAKU010A’UNDER PATENTDecember 7, 2031
- Evipo041PP24171Clematis plant named ‘Evipo041’UNDER PATENTDecember 9, 2031
- Evipo042PP24172Clematis plant named ‘Evipo042’UNDER PATENTDecember 9, 2031
- ZoqumPP23920Clematis plant named ‘Zoqum’UNDER PATENTJanuary 25, 2032
- ZomoaPP23849Clematis plant named ‘Zomoa’UNDER PATENTApril 18, 2032
- ZoprikaPP23850Clematis plant named ‘Zoprika’UNDER PATENTApril 18, 2032
- ZobadolPP23851Clematis plant named ‘Zobadol’UNDER PATENTApril 20, 2032
- ZobastPP23870Clematis plant named ‘Zobast’UNDER PATENTApril 27, 2032
- Diamond BallPP24045Clematis plant named ‘Diamond Ball’UNDER PATENTMay 2, 2032
- Sweet Summer LovePP24044Clematis plant named ‘Sweet Summer Love’UNDER PATENTMay 4, 2032
- Evipo045PP24815Clematis plant named ‘Evipo045’UNDER PATENTMay 31, 2032
- Evipo055PP24513Clematis plant named ‘Evipo055’UNDER PATENTJune 12, 2032
- SUZY MAC IMPROVEDPP24143Clematis plant named ‘SUZY MAC IMPROVED’UNDER PATENTJuly 16, 2032
- YAKU050PP24492Clematis plant named ‘YAKU050’UNDER PATENTJuly 18, 2032
- KrakowiakPP24374Clematis plant named ‘Krakowiak’UNDER PATENTAugust 17, 2032
- Evipo040PP25608Clematis plant named ‘Evipo040’UNDER PATENTDecember 15, 2032
- Evipo044PP24747Clematis plant named ‘Evipo044’UNDER PATENTDecember 27, 2032
- OvationPP24954Clematis plant named ‘Ovation’UNDER PATENTFebruary 8, 2033
- ZocoroPP24642Clematis plant named ‘Zocoro’UNDER PATENTFebruary 12, 2033
- Evipo053PP25921Clematis plant named ‘Evipo053’UNDER PATENTOctober 31, 2033
- VitiwesterPP25727Clematis plant named ‘Vitiwester’UNDER PATENTNovember 30, 2033
- Evipo035PP26580Clematis plant named ‘Evipo035’UNDER PATENTFebruary 11, 2034
- Zo06137PP25898Clematis plant named ‘Zo06137’UNDER PATENTMay 3, 2034
- BLUE GLOSSPP26373Clematis plant named ‘BLUE GLOSS’UNDER PATENTAugust 6, 2034
- Passion PlumPP26506Clematis plant named ‘Passion Plum’UNDER PATENTAugust 8, 2034
- MistyPP26504Clematis plant named ‘Misty’UNDER PATENTAugust 13, 2034
- Blue JeannePP26505Clematis plant named ‘Blue Jeanne’UNDER PATENTAugust 14, 2034
- Evipo054PP27282Clematis plant named ‘Evipo054’UNDER PATENTSeptember 1, 2034
- BFCCSARPP26880Clematis plant named ‘BFCCSAR’UNDER PATENTSeptember 5, 2034
- Evipo048PP27253Clematis plant named ‘Evipo048’UNDER PATENTSeptember 9, 2034
- Evipo071PP27352Clematis plant named ‘Evipo071’UNDER PATENTSeptember 17, 2034
- FUCHSIA FLASHPP26879Clematis plant named ‘FUCHSIA FLASH’UNDER PATENTSeptember 24, 2034
- Evipo070PP27254Clematis plant named ‘Evipo070’UNDER PATENTDecember 24, 2034
- Evipo056PP27279Clematis plant named ‘Evipo056’UNDER PATENTDecember 24, 2034
- Evipo027PP27281Clematis plant named ‘Evipo027’UNDER PATENTDecember 24, 2034
- Evipo061PP27332Clematis plant named ‘Evipo061’UNDER PATENTDecember 24, 2034
- Evipo051PP27280Clematis plant named ‘Evipo051’UNDER PATENTDecember 25, 2034
- Evipo066PP27283Clematis plant named ‘Evipo066’UNDER PATENTDecember 25, 2034
- Evipo069PP27714Clematis plant named ‘Evipo069’UNDER PATENTDecember 27, 2034
- YAKU26PP26881Clematis plant named ‘YAKU26’UNDER PATENTJanuary 9, 2035
- TRA27PP27592Clematis plant named ‘TRA27’UNDER PATENTFebruary 20, 2035
- TRAJEMPP27593Clematis plant named ‘TRAJEM’UNDER PATENTFebruary 20, 2035
- TRA73PP27595Clematis plant named ‘TRA73’UNDER PATENTFebruary 20, 2035
- TRA415PP27594Clematis plant named ‘TRA415’UNDER PATENTFebruary 21, 2035
- TRA35PP27596Clematis plant named ‘TRA35’UNDER PATENTFebruary 21, 2035
- Zo09045PP27649Clematis plant named ‘Zo09045’UNDER PATENTApril 19, 2035
- Zo09113PP27172Clematis plant named ‘Zo09113’UNDER PATENTApril 21, 2035
- STEFAN FRANCZAKPP27664Clematis plant named ‘STEFAN FRANCZAK’UNDER PATENTApril 24, 2035
- VIVA POLONIAPP27753Clematis plant named ‘VIVA POLONIA’UNDER PATENTApril 26, 2035
- TaigaPP27591Clematis plant named ‘Taiga’UNDER PATENTMay 31, 2035
- BFCCFLAPP27666Clematis plant named ‘BFCCFLA’UNDER PATENTJune 29, 2035
- BFCCRAPPP27667Clematis plant named ‘BFCCRAP’UNDER PATENTJune 29, 2035
- BFCCDELPP27684Clematis plant named ‘BFCCDEL’UNDER PATENTJune 29, 2035
- KBK06PP27754Clematis plant named ‘KBK06’UNDER PATENTJune 29, 2035
- Evipo057PP28601Clematis plant named ‘Evipo057’UNDER PATENTOctober 1, 2035
- Evipo067PP28602Clematis plant named ‘Evipo067’UNDER PATENTOctober 1, 2035
- Evipo050PP28586Clematis plant named ‘Evipo050’UNDER PATENTOctober 5, 2035
- Evipo068PP28551Clematis plant named ‘Evipo068’UNDER PATENTOctober 7, 2035
- Evipo052PP28600Clematis plant named ‘Evipo052’UNDER PATENTOctober 9, 2035
- Evipo072PP28361Clematis plant named ‘Evipo072’UNDER PATENTOctober 14, 2035
- Evipo063PP28362Clematis plant named ‘Evipo063’UNDER PATENTOctober 14, 2035
- Evipo049PP28406Clematis plant named ‘Evipo049’UNDER PATENTOctober 14, 2035
- Evipo047PP28371Clematis plant named ‘Evipo047’UNDER PATENTOctober 15, 2035
- Evipo074PP28407Clematis plant named ‘Evipo074’UNDER PATENTOctober 15, 2035
- Evipo059PP28671Clematis plant named ‘Evipo059’UNDER PATENTOctober 15, 2035
- Evipo058PP28552Clematis plant named ‘Evipo058’UNDER PATENTOctober 19, 2035
- HJJ-HAZ01PP27665Clematis plant named ‘HJJ-HAZ01’UNDER PATENTNovember 5, 2035
- DonahrosPP29554Clematis plant named ‘Donahros’UNDER PATENTJuly 26, 2036
- WIT141205PP28889Clematis plant named ‘WIT141205’UNDER PATENTAugust 31, 2036
- Evipo078PP29052Clematis plant named ‘Evipo078’UNDER PATENTSeptember 6, 2036
- Evipo076PP29131Clematis plant named ‘Evipo076’UNDER PATENTSeptember 6, 2036
- Evipo077PP29150Clematis plant named ‘Evipo077’UNDER PATENTSeptember 6, 2036
- Evipo100PP29236Clematis plant named ‘Evipo100’UNDER PATENTSeptember 6, 2036
- Evipo089PP30093Clematis plant named ‘Evipo089’UNDER PATENTSeptember 5, 2037
- KokonoePP30982Clematis plant named ‘Kokonoe’UNDER PATENTMarch 21, 2038
- Zo09146PP30634Clematis plant named ‘Zo09146’UNDER PATENTApril 5, 2038
- Violet StardustPP30555Clematis plant named ‘Violet Stardust’UNDER PATENTMay 17, 2038
- Stand by MePP30556Clematis plant name ‘Stand by Me’UNDER PATENTMay 17, 2038
- Zo08159PP31320Clematis plant named ‘Zo08159’UNDER PATENTJuly 9, 2038
- Zo12220PP31349Clematis plant named ‘Zo12220’UNDER PATENTJuly 9, 2038
- Zo08171PP31350Clematis plant named ‘Zo08171’UNDER PATENTJuly 9, 2038
- Evipo092PP30955Clematis plant named ‘Evipo092’UNDER PATENTSeptember 10, 2038
- Evipo084PP30956Clematis plant named ‘Evipo084’UNDER PATENTSeptember 10, 2038
- Evipo096PP31085Clematis plant named ‘Evipo096’UNDER PATENTSeptember 10, 2038
- Evipo090PP31086Clematis plant named ‘Evipo090’UNDER PATENTSeptember 10, 2038
- Evipo081PP31113Clematis plant named ‘Evipo081’UNDER PATENTSeptember 10, 2038
- Evipo080PP31203Clematis plant named ‘Evipo080’UNDER PATENTSeptember 10, 2038
- Evipo110PP31319Clematis plant named ‘Evipo110’UNDER PATENTSeptember 10, 2038
- Evipo083PP31476Clematis plant named ‘Evipo083’UNDER PATENTSeptember 10, 2038
- Evipo085PP31529Clematis plant named ‘Evipo085’UNDER PATENTSeptember 10, 2038
- Evipo101PP31530Clematis plant named ‘Evipo101’UNDER PATENTSeptember 10, 2038
- Evipo102PP31582Clematis plant named ‘Evipo102’UNDER PATENTSeptember 10, 2038
- Evipo099PP31583Clematis plant named ‘Evipo099’UNDER PATENTSeptember 10, 2038
- Evipo093PP31611Clematis plant named ‘Evipo093’UNDER PATENTSeptember 10, 2038
- Evipo094PP31966Clematis plant named ‘Evipo094’UNDER PATENTSeptember 10, 2038
- Evipo065PP32019Clematis plant named ‘Evipo065’UNDER PATENTSeptember 10, 2038
- Zo14100PP32355Clematis plant named ‘Zo14100’UNDER PATENTAugust 1, 2039
- UTOP013PP32583Clematis plant named ‘UTOP013’UNDER PATENTAugust 1, 2039
- Zo08160PP32543Clematis plant named ‘Zo08160’UNDER PATENTAugust 13, 2039
- Zo09122PP32544Clematis plant named ‘Zo09122’UNDER PATENTAugust 13, 2039
- Zo11112PP32582Clematis plant named ‘Zo11112’UNDER PATENTAugust 13, 2039
- Evipo095PP32802Clematis viticella plant named ‘Evipo095’UNDER PATENTSeptember 3, 2039
- ManjuPP33204Clematis plant named ‘Manju’UNDER PATENTJuly 31, 2040
- Evipo107PP33231Clematis plant named ‘Evipo107’UNDER PATENTSeptember 3, 2040
- GOLDEN DREAMPP33363Clematis plant ‘GOLDEN DREAM’UNDER PATENTOctober 26, 2040
- Evipo114PP34613Clematis plant named ‘Evipo114’UNDER PATENTSeptember 7, 2041
- Evipo103PP34626Clematis plant named ‘Evipo103’UNDER PATENTSeptember 7, 2041
- Evipo109PP34702Clematis plant named ‘Evipo109’UNDER PATENTSeptember 7, 2041
- Evipo106PP34823Clematis plant named ‘Evipo106’UNDER PATENTSeptember 7, 2041
- Evipo105PP34905Clematis plant named ‘Evipo105’UNDER PATENTSeptember 7, 2041
- Rain DancePP33875Clematis plant named ‘Rain Dance’UNDER PATENTSeptember 8, 2041
- Evipo104PP34701Clematis plant named ‘Evipo104’UNDER PATENTOctober 20, 2041
- Stand by Me LavenderPP34275Clematis plant named ‘Stand by Me Lavender’UNDER PATENTNovember 29, 2041
- Evipo115PP35269Clematis plant named ‘Evipo115’UNDER PATENTSeptember 13, 2042
- EviGsy151PP35803Clematis plant named ‘EviGsy151’UNDER PATENTJuly 7, 2043
- Zo18197PP35804Clematis plant named ‘Zo18197’UNDER PATENTJuly 22, 2043
- Zo18179PP35882Clematis plant named ‘Zo18179’UNDER PATENTAugust 6, 2043
- Evipo117PP35785Clematis plant named ‘Evipo117’UNDER PATENTSeptember 8, 2043
- Evipo116PP35865Clematis plant named ‘Evipo116’UNDER PATENTSeptember 8, 2043
- BIRTHDAY GIRLPP36089Clematis plant named ‘BIRTHDAY GIRL’UNDER PATENTNovember 6, 2043
- Stand by Me PinkPP36188Clematis plant named ‘Stand by Me Pink’UNDER PATENTNovember 7, 2043
- EviGsy153PP36322Clematis plant named ‘EviGsy153’UNDER PATENTNovember 14, 2043
- DP136PP36692Clematis plant named ‘DP136’UNDER PATENTNovember 16, 2043
- EviGsy152PP36717Clematis plant named ‘EviGsy152’UNDER PATENTDecember 11, 2043
- Zo23015PP36525Clematis plant named ‘Zo23015’UNDER PATENTAugust 19, 2044
- Violet LampionPP37273Clematis plant named ‘Violet Lampion’UNDER PATENTAugust 19, 2044
- Evipo119PP36669Clematis plant named ‘Evipo119’UNDER PATENTSeptember 30, 2044
- EviGsy155PP36986Clematis plant named ‘EviGsy155’UNDER PATENTApril 18, 2045
- EviGsy154PP37085Clematis plant named ‘EviGsy154’UNDER PATENTApril 30, 2045
Already in the public domain — 61 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.
- Ice CrystalPP18352Clematis plant named ‘Ice Crystal’PUBLIC DOMAINJuly 27, 2026
- Tie DyePP18913Clematis plant named ‘Tie Dye’PUBLIC DOMAINJuly 19, 2026
- Evipo037PP18104Clematis plant named ‘Evipo037’PUBLIC DOMAINMay 3, 2026
- EVIpo004PP17718Clematis variety ‘EVIpo004’PUBLIC DOMAINMarch 1, 2026
- Center StarPP17010Clematis plant named ‘Center Star’PUBLIC DOMAINJune 12, 2025
- EVIpo009PP17704Clematis plant named ‘EVIpo009’PUBLIC DOMAINApril 16, 2025
- EVIpo001PP17705Clematis plant named ‘EVIpo001’PUBLIC DOMAINApril 16, 2025
- Evipo029PP16471Clematis plant named ‘Evipo029’PUBLIC DOMAINJanuary 18, 2025
- Cleminov 51PP17012Clematis plant named ‘Cleminov 51’PUBLIC DOMAINJanuary 11, 2025
- Evipo006PP17123Clematis plant named ‘Evipo006’PUBLIC DOMAINJanuary 5, 2025
- HendryettaPP16589Clematis plant named ‘Hendryetta’PUBLIC DOMAINDecember 14, 2024
- EVIpo021PP16191Clematis plant named ‘EVIpo021’PUBLIC DOMAINDecember 8, 2024
- Evipo032PP16193Clematis plant named ‘Evipo032’PUBLIC DOMAINNovember 21, 2024
- Evipo036PP16093Clematis plant named ‘Evipo036’PUBLIC DOMAINNovember 20, 2024
- Evipo011PP16072Clematis plant named ‘Evipo011’PUBLIC DOMAINNovember 13, 2024
- Evipo034PP16073Clematis plant named ‘Evipo034’PUBLIC DOMAINOctober 9, 2024
- Evipo033PP16074Clematis plant named ‘Evipo033’PUBLIC DOMAINOctober 9, 2024
- Evipo003PP16092Clematis plant named ‘Evipo003’PUBLIC DOMAINSeptember 24, 2024
- EVIPO031PP16022Clematis plant named ‘EVIPO031’PUBLIC DOMAINSeptember 18, 2024
- CarnivalPP17597Clematis plant named ‘Carnival’PUBLIC DOMAINSeptember 13, 2024
- EVIpo008PP15745Clematis plant named ‘EVIpo008’PUBLIC DOMAINJuly 7, 2024
- Evipo030PP15991Clematis plant named ‘Evipo030’PUBLIC DOMAINJune 16, 2024
- Evipo020PP16012Clematis plant named ‘Evipo020’PUBLIC DOMAINMay 21, 2024
- Evipo019PP16069Clematis plant named ‘Evipo019’PUBLIC DOMAINMay 14, 2024
- Evipo018PP16267Clematis plant named ‘Evipo018’PUBLIC DOMAINApril 7, 2024
- EVIpo015PP15418Clematis plant named ‘EVIpo015’PUBLIC DOMAINJanuary 12, 2024
- EVIpo002PP15797Clematis variety ‘EVIpo002’PUBLIC DOMAINSeptember 1, 2023
- EVIpo025PP15165Clematis plant named ‘EVIpo025’PUBLIC DOMAINAugust 24, 2023
- EVIpo024PP15156Clematis viticella plant named ‘EVIpo024’PUBLIC DOMAINAugust 17, 2023
- EVIpo017PP15163Clematis plant named ‘EVIpo017’PUBLIC DOMAINAugust 17, 2023
- EVIpo005PP16844Clematis plant named ‘EVIpo005’PUBLIC DOMAINJuly 18, 2023
- EVIpo012PP15682Clematis plant named ‘EVIpo012’PUBLIC DOMAINMay 15, 2023
- EVIpo014PP15795Clematis variety ‘EVIpo014’PUBLIC DOMAINMay 15, 2023
- EVIpo013PP15832Clematis variety ‘EVIpo013’PUBLIC DOMAINMay 15, 2023
- Pretty in BluePP14823Clematis plant named ‘Pretty in Blue’PUBLIC DOMAINApril 29, 2023
- White AbundancePP15211Clematis plant named ‘White Abundance’PUBLIC DOMAINApril 7, 2023
- FascinationPP14770Clematis plant named ‘Fascination’PUBLIC DOMAINApril 6, 2023
- Barbara HarringtonPP15594Clematis plant named ‘Barbara Harrington’PUBLIC DOMAINMarch 19, 2023
- Fairy BluePP18223Clematis plant ‘Fairy Blue’PUBLIC DOMAINFebruary 14, 2023
- Snow ValleyPP15031Clematis plant named ‘Snow Valley’PUBLIC DOMAINJanuary 20, 2023
- Prinsesse AlexandraPP13975Clematis plant named ‘Prinsesse Alexandra’PUBLIC DOMAINMay 6, 2022
- New LovePP13977Clematis plant named ‘New Love’PUBLIC DOMAINMay 6, 2022
- VansoPP15953Clematis plant named ‘Vanso’PUBLIC DOMAINApril 19, 2022
- EVIridaPP15093Clematis plant named ‘EVIrida’PUBLIC DOMAINJanuary 14, 2022
- SprinklesPP14787Clematis plant named ‘Sprinkles’PUBLIC DOMAINOctober 1, 2021
- ZoinPP14054Clematis plant named ‘Zoin’PUBLIC DOMAINSeptember 29, 2021
- EvijohillPP12912Clematis plant named ‘Evijohill’PUBLIC DOMAINFebruary 12, 2019
- EVIrinPP12838Clematis plant named ‘EVIrin’PUBLIC DOMAINOctober 22, 2018
- AlbloPP11498Clematis plant named `Alblo`PUBLIC DOMAINAugust 5, 2018
- EvistaPP10932Clematis plant named `Evista`PUBLIC DOMAINOctober 17, 2017
- EVIfivePP10913Clematis plant named `EVIfive`PUBLIC DOMAINSeptember 10, 2017
- POULalaPP10990Clematis plant named `POULala`PUBLIC DOMAINSeptember 10, 2017
- EVIsixPP11013Clematis variety named `EVIsix`PUBLIC DOMAINSeptember 10, 2017
- KugotiaPP10952Clematis plant named `Kugotia`PUBLIC DOMAINJune 20, 2017
- EvionePP10222Clematis plant named `Evione`PUBLIC DOMAINApril 5, 2016
- EvitwoPP10167Clematis plant named `Evitwo`PUBLIC DOMAINApril 4, 2016
- vinoPP9290Clematis named `vino`PUBLIC DOMAINOctober 28, 2014
- EvifourPP9299Clematis names `Evifour`PUBLIC DOMAINOctober 28, 2014
- EvithreePP9362Clematis named EvithreePUBLIC DOMAINOctober 28, 2014
- HakubaPP6691Clematis plant named HakubaPUBLIC DOMAINOctober 21, 2007
- EnaPP6692Clematis plant named EnaPUBLIC DOMAINOctober 21, 2007
Botanically this is Clematis. 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.