Skip to content
The Patent Garden

US Plant Patent PP18131

TWISTED SISTER

Phormium plant named ‘TWISTED SISTER’

PUBLIC DOMAIN

Patent expired February 25, 2026. This plant is in the public domain — anyone may propagate and sell it.

Twenty years from the filing date would end on February 9, 2026. This patent earned 16 days of term adjustment for delay at the Patent Office, which is why it runs longer.

Figure 1 of US plant patent PP18131, the photograph of TWISTED SISTER printed in the patent.
Figure 1 from US Plant Patent PP18131, reproduced as printed. Photographs in a plant patent are taken by the applicant. Reproduction of the patent document is permitted; the image is shown whole and uncropped for that reason.

The record

Patent number
PP18131
Filed
February 9, 2006
Granted
October 16, 2007
Expires
February 25, 2026
Assignee
WOOLMORE MALCOLM
Inventor
WOOLMORE MALCOLM

Abstract

A new cultivar of Phormium plant named ‘TWISTED SISTER’ that is characterized by upright clumping habit, small overall size, and twisted leaves that are grey-green in color, with a pronounced orange-brown margin. In combination these traits set ‘TWISTED SISTER’ apart from all other existing varieties of Phormium known to the inventor.

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 Phormium plant named ‘TWISTED SISTER’ as described and illustrated herein.

Read the full patent: US Plant Patent PP18131 in full — the complete specification, every figure, and the file history.