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US Plant Patent PP18593

True Blue

Hydrangea plant named ‘True Blue’

PUBLIC DOMAIN

Patent expired January 27, 2026. This plant is in the public domain — anyone may propagate and sell it.

No term adjustment or disclaimer is recorded against this patent, so this is the full statutory term — twenty years from the filing date.

Figure 1 of US plant patent PP18593, the photograph of True Blue printed in the patent.
Figure 1 from US Plant Patent PP18593, 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
PP18593
Filed
January 27, 2006
Granted
March 11, 2008
Expires
January 27, 2026
Assignee
BAY CITY FLOWER CO
Inventor
HIGAKI HARRISON

Abstract

A new and distinct cultivar of Hydrangea macrophylla (Thunb.) named ‘True Blue’ originated as a controlled cross between the cultivars ‘Blue Sky’ and ‘Blue Danube’. The cultivar ‘True Blue’ has blue—R.H.S. 100 A (blue group) sepals at maturity and is distinguished from other similar cultivars of which the inventor is aware by its sepal color, and its compact and sturdy growth habit. ‘True Blue’ has large showy inflorescences, having both sepalous and non-sepalous florets, although at maturity the sepalous florets hide the non-sepalous florets.

Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.

1. A new and distinct Hydrangea macrophylla plant named ‘True Blue’ substantially as herein shown and described.

Read the full patent: US Plant Patent PP18593 in full — the complete specification, every figure, and the file history.