Ajuga ‘Silver Queen’ has grayish green leaves with white edges topped with blue flowers in spring making this a beautiful groundcover.

Ajuga tenorii 'Princess Nadia' has gorgeous variegated leaves in shades of grey-green, cream, and pink topped with reblooming purple-blue flower spikes.

Ajuga Feathered Friends 'Cordial Canary' is a semi-evergreen bugleweed with bright gold foliage and cobalt-blue flowers.

Ajuga Feathered Friends 'Fancy Finch' is a semi-evergreen bugleweed offering colours of gold, bronze and green with blue flowers.

Ajuga Feathered Friends 'Fierce Falcon' is a semi-evergreen bugleweed with glossy, purple to black foliage and cobalt-blue flowers.

Ajuga Feathered Friends 'Noble Nightingale' is a semi-evergreen bugleweed with metallic black leaves and cobalt with blue flowers.

Ajuga Feathered Friends 'Parrot Paradise' is a semi-evergreen bugleweed with yellow, orange, and red leaves with blue flowers.

Ajuga Feathered Friends 'Petite Parakeet' offers shades of yellow, red and green leaves with cobalt blue flowers.

Ajuga Feathered Friends 'Tropical Toucan' is a semi-evergreen bugleweed with golden yellow leaves with blue flowers.

Allium beesianum is a rare species from China with blue, nodding umbels above grass-like foliage.

Allium caeruleum has royal blue flowers and hails from central Asia, western Siberia and China.

Allium caesium is a rare ornamental onion with large 4 inch wide, sky blue to milky royal blue spheres held on stems to about two feet tall.

Allium cyaneum forms clumps of violet blue, pendant shaped flowers above fine foliage in June and July.

Alstroemeria Inticancha 'Indigo' is a Peruvian lily that has blue-purple flowers with white throats that bloom from summer to fall.

Amsonia hubrichtii is a beautiful species with showy blue flowers and attractive, needle-like foliage that offers incredible foliage texture and bright gold fall colour.

Amsonia hubrichtii 'Butterscotch' is a blue star with powder-blue flowers and willow-like foliage with bright gold fall colour.

Amsonia 'Starstruck' displays star-like periwinkle blue flowers above silver veined foliage on dramatic near-black stems.

Amsonia 'Storm Cloud' displays star-like periwinkle blue flowers above silver veined foliage on dramatic near-black stems.

Two tones of dark and light blue make the flowers of Amsonia 'Blue Ice' the best in the genus.

Amsonia 'String Theory' is a hybrid blue star displaying star-like baby blue flowers above dark green threadleaf foliage.