US Plant Patent PP31908
Sweet Tart
Coreopsis plant named ‘Sweet Tart’
UNDER PATENT
Still under patent. Protection ends July 8, 2039.
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
- PP31908
- Filed
- July 8, 2019
- Granted
- June 23, 2020
- Expires
- July 8, 2039
- Assignee
- PROBST DARRELL R
- Inventor
- PROBST DARRELL R
Abstract
A new cultivar of hybrid Coreopsis plant named ‘Sweet Tart’ that is characterized by its sturdy, well-branched plant habit reaching an average of 40 cm in height and 70 cm in width, its floriferous and long blooming season of nearly sterile inflorescences that do not require deadheading; bloom commences in early July and lasts until frost in Kensington, Conn., its medium sized inflorescences with ray florets that are vibrant raspberry rose in color with a small area of yellow at the base (insignificant eye zone), its resistance to powdery mildew (Podosphaera macularis) and leafspot (Pseudomonas cichorii) and its cold hardiness at least to U.S.D.A. Zone 5a.
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 ‘Sweet Tart’ as herein illustrated and described.
Read the full patent: US Plant Patent PP31908 in full — the complete specification, every figure, and the file history.