Agapanthus 'Silver Moon' has variegated leaves light lavender-blue flowers in rounded clusters.

Agapanthus 'Stevie's Wonder' is a relatively large, hardy lily-of-the-nile with dark purple-blue flowers over lush green strap-like leaves.

Agapanthus 'Storm Cloud' has deep cobalt blue flowers held in loose spheres atop subtropical foliage. Great in pots or in the ground.

Agapanthus 'Summer Love Blue' has fragrant violet-blue flowers on strong green stems and green, strap-like foliage.

Agapanthus 'Summer Skies' has light blue flowers with dark blue streaks on tall sturdy stems rising above green strap-like foliage.

Agapanthus 'Twister' is a striking bicolour lily-of-the-nile with rich blue and white flowers.

Agapanthus 'Valencia' offers sky blue flowers with darker veins and reverses on dark stems.

'White Heaven' produces large heads of white flowers.

Agastache 'Golden Jubilee' blooms for ages with blue-purple spikes attracting pollinators from miles around atop gold foliage.

Agastache 'Blue Bayou' is a long-blooming hummingbird mint with blue tubular flowers and aromatic foliage.

Hot sunny spots will never be the same with long-blooming Agastache 'Blue Boa'. Butterflies and bees will love you!

'Crazy Fortune' is a sport of Agastache 'Blue Fortune' with lavender blue flowers and variegated foliage.

Kudos 'Silver Blue' hummingbird mint is an Agastache with purple-blue flowers atop fragrant foliage for months in the sunny garden.

Agastache Sunrise 'Blue' is a long-blooming hummingbird mint with violet-blue tubular flowers and fragrant foliage.

'Black Scallop' bugleweed has scalloped, dark burgundy-black foliage and blue flowers in spring.

Ajuga reptans 'Blueberry Muffin' is a bugleweed with dark new foliage and blueberry-blue flowers on eight inch spikes.

Ajuga reptans 'Catlin's Giant' produces huge bronze evergreen leaves and tall blue spikes of flowers in the spring.

Ajuga ‘Valfredda’ Chocolate Chip has small, narrow, elongated leaves that are flushed with burgundy when young and in more sun.

Ajuga 'Dixie Chip' has cute little leaves in shades of green, cream and rosy-purple. A great groundcover for small situations.

Ajuga reptans ‘Golden Glow’ has gold and cream variegated foliage that is flushed with pink in cooler weather.

Ajuga reptans 'Princess Elsa' is an evergreen bugleweed with shiny, silver foliage and blue-purple flowers.