Clematis 'Veronica's Choice' is a stunning confection with fully double flowers of white, French gray, and palest blue.

Clematis 'Ville de Lyon' is a classic heirloom cultivar with carmine red flowers frosted with lavender pink.

'Violet Stardust' is a bush clematis with violet-blue, star-shaped flowers followed by pretty seed heads.

Clematis 'Walter Pennell' is a unique cultivar in both colour and form with interesting shades of pink on semi-double flowers.

Clematis 'Warsaw Nike' has rich velvet purple flowers illuminated with a magenta glow around yellow stamens.

Clematis 'Will Barron' has beautiful clear blue flowers with lighter central bands around yellow stamens.

Clematis 'Will Goodwin' has beautiful ruffled lavender-blue flowers with cream coloured stamens.

Clethra alnifolia 'Ruby Spice' is a compact shrub with pink and white bottlebrush flowers that are fragrant and nectar-rich.

Clethra alnifolia 'Summer Sparkler' is a compact shrub with long, twisting racemes of white flowers that are fragrant and nectar-rich.

Codonopsis clematidea produces pale blue, bell-shaped flowers yellow, orange, dark purple, and maroon inside.

Blue mistflower (Conoclinium coelestinum) has flat-topped clusters of fuzzy, lavender buttons on purplish stems in summer and fall.

Convallaria majalis 'Hardwick Hall' is a lily-of-the-valley with fragrant, white bell-shaped flowers and foliage that is rimmed in yellow.

Convallaria majalis 'Hofheim' is a rare form with gold to light green edged leaves, sometimes with extra stripes.

Coreopsis 'Gilded Lace' has fine, linear foliage on four feet tall stems topped with hundreds of cheerful, bright yellow, daisy-like flowers in summer.

Coreopsis tripteris is a 6 foot high tickseed producing masses of bright yellow flowers from summer to fall.

Coreopsis tripteris 'Gold Standard' is a 6 foot high tickseed producing masses of bright yellow flowers from summer to fall.

Coreopsis Big Bang 'Sun Splash' has all summer-long fiery flowers of bright red with golden tips.

Coreopsis Lil Bang 'Darling Clementine' has large flowers in tones of deep orange, tangerine orange, and golden yellow.

'Daybreak' is a great compact Coreopsis with single red flowers with a vibrant golden yellow edge on dark green foliage.

Coreopsis Lil Bang 'Enchanted Red' has large, deep red flowers with yellow centres surrounded by a dark ring that will bloom all summer long.

'Red Elf' is a dwarf coreopsis with very large, bright red flowers. This is a long blooming cultivar.

'Starlight' is a Coreopsis with creamy white flowers with burgundy centres and a pink flush in cool temperatures.

Coreopsis Lil Bang 'Starstruck' has big, two-tone petals of magenta and light pink all summer long.

'Red Satin' is a threadleaf Coreopsis with small, linear foliage topped with masses of red tickseed flowers.