US Plant Patent PP25566
PIIHM-II
Hydrangea macrophylla plant named ‘PIIHM-II’
UNDER PATENT
Still under patent. Protection ends April 6, 2033.
Twenty years from the filing date would end on November 5, 2032. This patent earned 152 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP25566
- Filed
- November 5, 2012
- Granted
- May 19, 2015
- Expires
- April 6, 2033
- Assignee
- PLANT INTRODUCTIONS INC, DIRR MICHAEL A
- Inventor
- DIRR MICHAEL A
Abstract
A new and distinct cultivar of Hydrangea macrophylla plant named ‘PIIHM-II’, characterized by its remontant (reblooming) trait, flowering on old wood and new growth of the season; dark pink mophead inflorescences in non-aluminum based media and violet-purple inflorescences in aluminum based media; inflorescences that age to rose-red and remain showy for an extended period of time; compact, rounded to spreading growth habit; dark green foliage; red stems; and resistance to powdery mildew.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
I claim: 1. A new and distinct Hydrangea macrophylla plant named ‘PIIHM-II’, substantially as illustrated and described herein.
Read the full patent: US Plant Patent PP25566 in full — the complete specification, every figure, and the file history.