US Plant Patent PP34419
String Theory
Amsonia plant named ‘String Theory’
UNDER PATENT
Still under patent. Protection ends November 29, 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
- PP34419
- Filed
- November 29, 2021
- Granted
- July 12, 2022
- Expires
- November 29, 2041
- Assignee
- WALTERS GARDENS INC, HANSEN HANS A
- Inventor
- HANSEN HANS A
Abstract
A new and distinct Amsonia plant named ‘String Theory’ characterized by winter-hardy, compact, densely-stemmed, clean habit with linear, dark-green foliage that goes dormant in the winter; single, light periwinkle-blue, star-shaped flowers on medium height scapes flowering above the foliage beginning about early-May and effective for about four weeks. The new plant is useful in the landscape as a specimen or en masse and also as a cut flower.
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 ornamental Blue Star, Amsonia plant named ‘String Theory’ as herein described and illustrated.
Read the full patent: US Plant Patent PP34419 in full — the complete specification, every figure, and the file history.