A herbaceous perennial, Trachelium caeruleum 'Black Knight' forms an erect, woody-based plant that bears dense violet-purple flower clusters. It typically reaches about 1.2 m and is often grown as a half-hardy summer bedding subject in the UK. Plants are well-branched and produce blooms from July to September. Suitable for containers, borders and cut flowers.

Trachelium caeruleum 'Black Knight' produces violet-purple clusters from July to September and suits containers, borders or conservatory culture.

Trachelium caeruleum 'Black Knight'

Blue Throatwort | Trachelium caeruleum 'Black Knight'

Trachelium lanceolatum is a member of the bellflower family (Campanulaceae) that flowers from July to September. Native to Sicilia, it is used as bedding, in conservatory or greenhouse displays, and can be grown as an herbaceous perennial or an annual/biennial depending on location. Plants are well-branched with deciduous foliage and favour full sun on moist but well-drained loam or sandy soils across a range of pH levels. It suits east- or west-facing sites and tolerates both exposed and sheltered positions.

Trachelium lanceolatum is a Sicilian bellflower that blooms from July to September and suits sunny borders, patios and containers.