Buddleia alternifolia is a  large deciduous shrub that has arching branches with narrow, grey / green leaves and clusters of  lilac-purple flowers. 

Buddleia Black Knight' is a large deciduous shrub. It's flowers are scented, deep purple, in elongated panicles. 

Buddleia Empire Blue is a large deciduous shrub with arching branches. It's flowers are scented and violet / blue in colour.

Buddleia Royal Red is a large deciduous shrub with arching branches. It's flowers are scented and are rich purple red in colour.