Chionodoxa forbesii 'Violet Beauty', glory-of-the-snow, is one of the first spring bulbs to bloom with its starry pink-violet flowers and white centres.

Chionodoxa luciliae 'Alba', glory-of-the-snow, is one of the first bulbs to bloom in spring with its pure white flowers.

Choisya 'Bluestone' is a Cistus Nursery introduction with finely textured, linear leaflets in shades of greenish blue.

Chrysogonum virginiana var. australe or goldenstar is a an evergreen ground cover with single yellow flowers all summer long.

Poncirus trifoliata is the hardy trifoliate orange, a citrus relative that is a thorny, well-branched, deciduous shrub or small tree.

Poncirus trifoliata 'Monstrosa' or 'Flying Dragon' is a semi-dwarf form of the trifoliate orange with wonderful contorted stems.

Poncirus trifoliata 'Snow Dragon' is a variegated and contorted form of the trifoliate orange 'Monstrosa' or 'Flying Dragon'.

Clematis alpina 'Constance' displays deep purple-pink tepals with white staminodes.

Clematis alpina 'Francis Rivis' displays deep blue tepals with white staminodes.

Clematis cirrhosa 'Balearica' is an evergreen, winter-blooming species with fragrant, creamy white, bell-shaped flowers.

Clematis fasciculiflora has wonderful burgundy-infused new growth and silver-centred leaves with fragrant winter flowers.

Clematis florida 'Manju Kokonoe White' is a spectacular cultivar from Japan with double, creamy green and white flowers.

Clematis 'New Love' is a non-climbing bush clematis with fragrant blue flowers.

Clematis integrifolia 'Fascination' has 1.5" (4cm) deep and 1"(3cm) across dark glossy violet nodding bell shaped flowers.

Clematis 'Chloe' is a non-climbing, re-blooming bush clematis with violet flowers and yellow tipped anthers. Re-bloomer.

Clematis integrifolia 'Olgae' has 1.5" (4cm) deep and 2" (5cm) across mid-blue scented flowers that curve out and upwards.

Clematis koreana 'Fragans' is almost identical to C. koreana Brunet with a slight fragrance.

Clematis lanuginosa 'Candida' features crisp white 6-8" (15-20cm) blooms.

Clematis macropetala 'Jan Lindmark' is a unique dark purplish pink variety. 2-3" (5-8cm) double open bell shaped flowers.

Clematis montana 'Fragant Spring' offers masses of clear pink fragrant blooms.

Clematis recta is a non-twining clematis with rich burgundy foliage and hundreds of fragrant, star-like, vanilla-scented flowers.

Clematis tangutica 'Golden Harvest' has golden yellow nodding flowers with near black stamens.