US Plant Patent PP31587
Summer Carnival
Hibiscus plant named ‘Summer Carnival’
UNDER PATENT
Still under patent. Protection ends November 5, 2038.
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
- PP31587
- Filed
- November 5, 2018
- Granted
- March 24, 2020
- Expires
- November 5, 2038
- Assignee
- WALTERS GARDENS INC, HANSEN HANS A
- Inventor
- HANSEN HANS A
Abstract
A new and distinct cultivar of winter-hardy, herbaceous, perennial, hybrid Hibiscus plant named ‘Summer Carnival’ comprising an upright habit of multiple, well-branched, basal stems producing flowers near the top of the plant. Flowers are hot cerise, and the calyces display light green sepal centers and pale yellow margins while in bud and after flower drop. The foliage is primarily three-lobed, deeply incised, and grayish-green with creamy irregular margins frequently blushed with reddish purple. The stems exposed to high ultraviolet light develop reddish coloration.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
I claim: 1. A new cultivar of hardy herbaceous perennial Hibiscus hybrid plant named ‘Summer Carnival’ as herein illustrated and described.
Read the full patent: US Plant Patent PP31587 in full — the complete specification, every figure, and the file history.