US Plant Patent PP13859
Jack Frost
Brunnera macrophylla plant named ‘Jack Frost’
PUBLIC DOMAIN
Patent expired May 25, 2021. This plant is in the public domain — anyone may propagate and sell it.
Twenty years from the filing date would end on March 5, 2021. This patent earned 81 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP13859
- Filed
- March 5, 2001
- Granted
- June 3, 2003
- Expires
- May 25, 2021
- Inventor
- WALTERS JOHN D
Abstract
The new and distinctive cultivar of Brunnera named ‘Jack Frost’ characterized by an intense silver coating on top of the leaves with contrasting green veining and leaf edges, and light blue flowers in the spring, suitable for landscape or potted culture.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
What is claimed is: 1. I claim a new and distinct perennial Brunnera macrophylla plant named ‘Jack Frost’, as herein described and illustrated.
Read the full patent: US Plant Patent PP13859 in full — the complete specification, every figure, and the file history.