Plant
Hydrangea anomala subspecies petiolaris
2 US plant patents name this plant. 2 have expired, so those cultivars are free to propagate and sell.
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.
- KasaiPP13845Hydrangea anomala subspecies petiolaris plant named ‘Kasai’PUBLIC DOMAINJuly 18, 2020
- Kuga VariegatedPP13247Hydrangea anomala subspecies petiolaris plant named ‘Kuga Variegated’PUBLIC DOMAINJune 22, 2020
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.