Trachelium caeruleum ‘Black Knight’ – (Purple Umbrella Trachelium)


A showy attractive addition to the perennial border, which attracts beneficial insects and will add depth to the summer garden with its dark purpe flowers.


This plant has large panicles of tiny deep purple flowers on a upright bush.  The flowers are fragrant and are produced in early summer. They are attractive to bees and other beneficial insects.

The leaves on this new form are dark with dark purple veins.  It is a half hardy perennial, and can easily be grown as an annual in colder areas.

It is a show stopper when out in flower with its myriad of deep purple blooms covering the bush.

Sowing advice

For best results, sow seeds onto a good soil-based compost. Cover the seeds with fine grit or compost to approximately their own depth. They can be sown at any time, and although germination can be quicker if kept at 15 to 20 degrees C. However one can also sow most seeds in an unheated greenhouse and wait for natural germination as many seeds wait for spring before emerging regardless of when they are sown. Spring sowing will obviously give them a full season of growth. In colder climates these plants do well if overwintered in small pots indoors and are planted out

Additional information


Half Hardy Perennial

Common Name

Purple Umbrella Trachelium



Maximum Height

60 cm

Number of seeds in packet