US Plant Patent PP19991
Blue Chip
Buddleja plant named ‘Blue Chip’
UNDER PATENT
Still under patent. Protection ends November 9, 2027.
Twenty years from the filing date would end on August 23, 2027. This patent earned 78 days of term adjustment for delay at the Patent Office, which is why it runs longer.

The record
- Patent number
- PP19991
- Filed
- August 23, 2007
- Granted
- May 12, 2009
- Expires
- November 9, 2027
- Assignee
- UNIV NORTH CAROLINA STATE
- Inventor
- WERNER DENNIS JAMES; SNELLING LAYNE KARLTON
Abstract
Buddleja ‘Blue Chip’ is a new and distinct variety of butterfly bush that has the following unique combination of desirable features that are outstanding in a new variety. 1. Moderate vigor resulting in compact growth habit. 2. Ease of asexual propagation using softwood or semi-hardwood cuttings. 3. Spreading growth habit with multi-branched stems. 4. Male sterility, and low female fertility and reduced seed set, resulting in less opportunity for seedlings to originate in the landscape setting. 5. Blue flower color.
Show the legal claimThe single numbered claim as granted — the legal text that defines what this patent covers.
1. A new and distinct variety of butterfly bush tree ( Buddleja ) substantially as illustrated and described, characterized by its compact growth habit, multi-branched stems, grayed-green leaf color, and blue flower color.
Read the full patent: US Plant Patent PP19991 in full — the complete specification, every figure, and the file history.