Catnip
Nepeta

Purrsain Blue
Light:  Full sun
Height: 18"
Spacing: 24" 
Flower: June-Sept
Flower Colour: Blue
Foliage: Grey-green
Comments: Extremely fragrant, attracts butterflies
Purrsian Blue Catmint (Nepeta x faassenii 'Purrsian Blue') in Burlington  Waterdown Dundas Ontario Ontario ON at Connon Nurseries
Dropmore Blue
Light: Full sun
Height: 12"
Spacing: 12" 
Flower: June-Sept
Flower Colour: Blue
Foliage: Grey-green
Comments: Attracts butterflies
Dropmore Showy Catmint - Nepeta x faassenii 'Dropmore' | Flickr
Cats Meow
Light: Full sun
Height: 24"
Spacing: 36" 
Flower: Summer
Flower Colour: Sky blue
Foliage: Grey-green
Comments: Has a tidy dense shape
Cats Pajamas Catmint - Flowers And Bulbs | Veseys
Cats Pyjamas
Light: Full sun
Height: 20"
Spacing: 24" 
Flower: Summer
Flower Colour: Indigo blue
Foliage: Grey-green
Comments: Butterfly magnet
Nepeta 'Cat's Pajamas' - Garden Crossings
Kitten Around
Light: Full sun
Height: 14"
Spacing: 22" 
Flower: Summer
Flower Colour: Bright blue purple
Foliage: Green
Comments: Attracts butterflies, bees & hummingbirds
Nepeta' Kitten Around Catmint – Mountain Edge Nursery
Walkers Low
Light: Full sun to part shade
Height: 24"
Spacing: 24" 
Flower: May-Sept
Flower Colour: Purple-blue
Foliage: Grey-green
Comments: A long blooming dwarf form