The Perennial Plant Association's Perennial Plant of the Year Program promotes the use of perennials. Four perennials are selected by the Perennial Plant of the Year Committee from an extensive list of nominations made earlier by PPA members. Each year members cast their vote for one of the four selected plants with the following attributes:

• suitable for a wide range of climate types
• low maintenance
• easily propagated - easily comes true from seed or vegetative propagation
• exhibits multiple seasonal interest

The Perennial Plant of the Year for 2007 is Nepeta 'Walker's Low'