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Osmanthus heterophyllus 'Gulftide'. Photo: Jacksons Nurseries

Clematis 'Polish Spirit', Brushwood Nursery, is apparently one of the longest blooming clematis out there.

Corn lily (Veratrum californicum), from Dancing Oaks Nursery

Rhododendron 'Blue Baron', Weston Nurseries

Mt. Emei begonia (Begonia emeiensis), from Cistus Nursery.

'Hualampai Blue' yucca (Yucca baccata var. vespertina 'Hualampai Blue'), from Cistus Nursery.

Bignonia capreolata 'Tangerine Beauty' and Bignonia capreolata (species form) by jonlindstrom, via Flickr

Euphorbia Blackbird. Photo: Skagit Gardens

'Gold Bar' miscanthus (Miscanthus 'Gold Bar')

Canna indica ‘Purpurea’, photo by Nancy J. Ondra at Hayefield

Heuchera 'Stainless Steel' - What a color! - http://www.plantsnouveau.com/heuchera-stainless-steel/