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Sempervivum 'Black Knight'



A really striking dark foliaged cultivar that produces offsets vigorously. I thought it was at is best when it formed a crumbled carpet of spiky foliage. The individual rosettes are good but the massed effect is better. I got it from Blackthorn Nursery and their label says:

"Very dark rosettes with yellow flowers in summer. Good in a well-drained rockery, troughs or pots or on tufa."

It is a seedling found in the collection of H. J. Gensch and registered in 2008. Sempervivum list has an illustration showing the flowers as pale pink.



4th June 2005



10th November 2005 25th June 2006 21st March 2009



References:
  • Smith, Alan C. - Sempervivum and Jovibarbas , revised ed. 1980
  • Furness, Steve - Sempervivum, a gardeners guide, Alpine Garden Society, 2023
  • Wills, Howard and Sally - Sempervivum and Jovibarba, 2004
  • International Sempervivum Forum, https://sempervivum.aforumfree.com/.
  • Sempervivum List online, https://sempervivum-liste.de/de/sempervivum/black-knight, accessed 20.04.2025.
  • AGS Encyclopedia online, http://encyclopaedia.alpinegardensociety.net/plants/Sempervivum/CULTIVARS , accessed 12.06.2025.
  • Martin Miklanek, List of Sempervivum and Jovibarba cultivars, https://miklanek.tripod.com/MCS/cvA-E.html , accessed 12.06.2025.
  • Sempervivum Garden, https://sempervivumgarten.de , accessed 12.06.2025.