US Plant Patent PP19582
Achall
Monarda plant named ‘Achall’
UNDER PATENT
Still under patent. Protection ends April 19, 2027.
Twenty years from the filing date would end on January 3, 2027. This patent earned 106 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP19582
- Filed
- January 3, 2007
- Granted
- December 16, 2008
- Expires
- April 19, 2027
- Assignee
- CA MINISTER AGRICULTURE & FOOD
- Inventor
- DAVIDSON CAMPBELL G
Abstract
A new cultivar of bee balm, Monarda didyma ‘AChall’, that is characterized by its deep red-purple blossoms that are present abundantly in June through August. The new variety is mid sized in height with an upright oval plant habit, is hardy in U.S.D.A. Zones 3 to 8, and exhibits dark green semi-glossy foliage that has shown resistant to powdery mildew.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
1. A new and distinct cultivar of Monarda plant named ‘AChall’ as herein illustrated and described.
Read the full patent: US Plant Patent PP19582 in full — the complete specification, every figure, and the file history.