Genus
Polemonium
10 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 6 still protected comes off patent on September 11, 2027.
Still under patent — 6 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Touch of ClassPP19768Polemonium plant named ‘Touch of Class’UNDER PATENTSeptember 11, 2027
- Heaven ScentPP20214Polemonium plant named ‘Heaven Scent’UNDER PATENTJanuary 30, 2028
- PolelodgePP28653Polemonium plant named ‘Polelodge’UNDER PATENTApril 29, 2036
- DUNKALPP31787Polemonium plant named ‘DUNKAL’UNDER PATENTMay 3, 2039
- Golden FeathersPP35067Polemonium plant named ‘Golden Feathers’UNDER PATENTSeptember 6, 2042
- Hurricane RidgePP35878Polemonium plant named ‘Hurricane Ridge’UNDER PATENTApril 10, 2043
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.
- PolbressPP15367Polemonium plant named ‘Polbress’PUBLIC DOMAINJune 23, 2023
- Stairway to HeavenPP15187Polemonium reptans named ‘Stairway to Heaven’PUBLIC DOMAINAugust 7, 2022
- Snow and SapphiresPP13441Polemonium plant named ‘Snow and Sapphires’PUBLIC DOMAINDecember 20, 2021
- BrisePP9781Polemonium plant named Brise d'AnjouPUBLIC DOMAINJune 28, 2015
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.