US Plant Patent PP33990
Iron Lady
Coreopsis plant named ‘Iron Lady’
UNDER PATENT
Still under patent. Protection ends May 24, 2041.
No term adjustment or disclaimer is recorded against this patent, so this is the full statutory term — twenty years from the filing date.

The record
- Patent number
- PP33990
- Filed
- May 24, 2021
- Granted
- March 1, 2022
- Expires
- May 24, 2041
- Assignee
- PROBST DARRELL
- Inventor
- PROBST DARRELL
Abstract
A new cultivar of hybrid Coreopsis plant named ‘Iron Lady’ that is characterized by its compact, densely bushy plant habit reaching an average of 35 cm in height and 50 cm in width, its a floriferous and long blooming season of its nearly sterile inflorescences that do not require deadheading; bloom commences in late-June and lasts until frost in Kensington, Conn., its medium sized inflorescences with ray florets that are light yellow in color and flushed with red at the base, its flower intitiation without the need for vernalization, its resistance to powdery mildew and leafspot, and its cold hardiness at least to U.S.D.A. Zone 5.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
It is claimed: 1. A new and distinct cultivar of Coreopsis plant named ‘Iron Lady’ as herein illustrated and described.
Read the full patent: US Plant Patent PP33990 in full — the complete specification, every figure, and the file history.