Buddleja × weyeriana 'Sungold'

Buddleja × weyeriana 'Sungold' is a cultivar which arose as a sport of 'Golden Glow' at the nursery of P. G. Zwijnenburg in the Netherlands during the 1960s.[1][2][3] 'Sungold' was accorded the Royal Horticultural Society Award of Garden Merit (record 690) in 1993, reaffirmed in 2010.[4][5] A particularly floriferous specimen of 'Sungold' was introduced to the United States from Scotland by Mike Dirr in 1995, and propagated there as 'Honeycomb'; it later came top in the public poll of 57 Buddleja species and cultivars conducted by the University of Georgia in 1997.

Buddleja × weyeriana
'Sungold', Longstock Park, UK
Cultivar'Sungold'
OriginNetherlands

Description

'Sungold' is a vigorous shrub growing to a height of 2 metres (6 ft 7 in) if hard-pruned annually, bearing small panicles of rich golden-orange flowers, the panicles acute at the apex, further distinguishing the clone from 'Golden Glow'. Occasionally, near-white secondary panicles appear as sports near the end of the flowering season. The leaves are of average size for the hybrid, and mid-green in colour.[6][7] The nectar of B. × weyeriana is relatively complex, comprising three constituents in almost equal proportions: sucrose, fructose, and glucose, whereas the nectar of the common Buddleja davidii is almost exclusively sucrose.[8]

Ploidy: 2n = 76. [9]

Cultivation

'Sungold' is widely cultivated across Europe and the United States. Hardiness: RHS H4, USDA zones 7–9.[7]

References
  1. Hatch, L. (2007). Cultivars of Woody Plants. Vol. 1 (A-G) 2007 Edition. TCR Press Horticultural PDF. books.
  2. Bean, W. J. (1914). Trees and shrubs hardy in the British Isles. Eighth edition, revised by D. L. Clarke, 1989. Vol. 1, A-C. Murray, London.
  3. De Vogel, P (1967). Keuringen 1966. Dendroflora 4 (Jan 1967): 61
  4. Royal Horticultural Society (2010). Trials Report 2008-2010 Buddleja davidii and its close hybrids. Trials Office, The Royal Horticultural Society Garden, Wisley.
  5. "RHS Plant Selector - Buddleja × weyeriana 'Sungold'". Retrieved 15 April 2020.
  6. Moore, P. (2012). Buddleja List 2011-2012 Longstock Park Nursery. Longstock Park Nursery, UK.
  7. Stuart, D. (2006). Buddlejas. RHS Plant Collector Guide. Timber Press, Oregon. ISBN 978-0-88192-688-0
  8. Percival, M. (1961). Types of nectar in angiosperms. New Phytol. 60: 235-281. 1965. Pergamon Press, London.
  9. Norman, E. M. (2000). Buddlejaceae. Flora Neotropica 81. New York Botanical Garden, US


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