This grower is sure of this plant identification.
variety is 'Souvenir d'Andre Chaudron'
Nepeta sibirica (Catmint). There are about 200 species of summer-flowering perennials. They are rarely annuals. Some species have highly aromatic silver-grey foliage and are naturally compact while others tend to be taller growing plants and may benefit from staking.
They need a well-drained soil in a sunny position.
Italics = data drawn from parent genus or speciesView Full Plant Finder Record