Plant
Centaurea
5 US plant patents name this plant. 2 have expired, so those cultivars are free to propagate and sell. The next of the 3 still protected comes off patent on October 28, 2028.
Still under patent — 3 cultivars
Soonest to come off patent first. You may not propagate these for sale until the date shown.
- Amethyst DreamPP20781Centaurea plant named ‘Amethyst Dream’UNDER PATENTOctober 28, 2028
- Black SpritePP23250Centaurea plant named ‘Black Sprite’UNDER PATENTJuly 22, 2031
- BalcentsirlPP35838Centaurea plant named ‘Balcentsirl’UNDER PATENTSeptember 22, 2043
Already in the public domain — 2 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.
- Amethyst in snowPP18284Centaurea plant named ‘Amethyst in snow’PUBLIC DOMAINMay 22, 2026
- Gold BullionPP10865Centaurea plant named `Gold Bullion`PUBLIC DOMAINSeptember 22, 2017
Botanically this is Centaurea. 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.