Buddleja davidii 'Black Knight'

Buddleja davidii 'Black Knight' has been one of the most successful B. davidii cultivars ever released. A selection made by Ruys at the Moerheim Nursery, Dedemsvaart, Netherlands, circa 1959, it was accorded the RHS Award of Garden Merit (record 676) in 1993.[1][2] Seed is very viable, germination per 0.1 gram averaging 100, or approximately 600 fertile seeds per panicle.[3]

Buddleja davidii
'Black Knight', Longstock Park, UK
Cultivar'Black Knight'
OriginRuys, Dedemsvaart, Netherlands

Description

'Black Knight' grows to a height of 4.0 m. The cultivar is distinguished by its deep purple flowers, reckoned to be the darkest of all the B. davidii cultivars, but the panicles, at 15–20 cm in length, are smaller than the type. Moreover, the medium-green leaves do not complement the flowers. [4][5]

Cultivation

'Black Knight' is widely cultivated on both sides of the Atlantic. Hardiness: RHS H5, USDA zones 5–9.[2]

gollark: Yes, $9000 please.
gollark: Yes, by about three orders of magnitude.
gollark: I mean, you just calculated krist mined per hour compared to the average US wage, which makes zero sense.
gollark: So you just... randomly decided on that?
gollark: The one krist/money transaction I heard of was a few thousand krist for a few €.

References
  1. "RHS Plantfinder - Buddleja davidii 'Black Knight'". Royal Horticultural Society. Retrieved 21 January 2018.
  2. Stuart, D. D. (2006). Buddlejas. RHS Plant Collector Guide. Timber Press, Oregon. ISBN 978-0-88192-688-0
  3. Oregon Dept. of Agriculture. Sterile Buddleja List.
  4. Royal Horticultural Society. (2010). Trials Report, 2008–2010. Buddleja davidii and its close hybrids. RHS, Wisley, UK.
  5. Moore, P. (2011). List of Buddleja davidii cultivars held at Longstock Park Nursery, 2011. Longstock Park, UK.
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