Can there be joint inventors for a plant patent?

Yes, plant patent applications can have joint inventors. This is explicitly stated in MPEP 1604:

In an application for a plant patent, there can be joint inventors.

This statement is supported by the case Ex parte Kluis, 70 USPQ 165 (Bd. App. 1945), which established this precedent.

To learn more:

• plant patent
• joint inventors
• multiple inventors
• Ex parte Kluis