cupressus x leylandii


  • As a hybrid, although fertility of certain Leyland cypress forms were recently reported,[7][8] most Leyland cypress were thought to be sterile, and nearly all the trees now
    seen have resulted from cuttings originating from those few plants.

  • Eventually they found the six original trees developed by Leyland, and began propagating the species.

  • The two parent species would not likely cross in the wild, as their natural ranges are more than 400 miles (640 km) apart, but in 1888, the hybrid cross occurred when the
    female flowers or cones of Nootka cypress were fertilised by pollen from Monterey cypress.

  • [20] In 1953, a freak tornado blew down one of the original trees at Haggerston (the other original five trees still survive), on which the research division of the Forestry
    Commission started developing additional hybrids.

  • [13] Little (2006) proposed another alternative by transferring all the North American species of Cupressus, including the Monterey cypress (C. macrocarpa), to Callitropsis.

  • The shallow root structure also means that it is poorly adapted to areas with hot summers, such as the southern half of the United States.

  • The Leyland cypress, Cupressus × leylandii, often referred to simply as leylandii, is a fast-growing coniferous evergreen tree much used in horticulture, primarily for hedges
    and screens.

  • [5] Over 40 forms of Leyland cypress are known,[9] and as well as ‘Haggerston Grey’ and ‘Leighton Green’, other well-known forms include ‘Stapehill’, which was discovered
    in 1940 in a garden in Ferndown, Dorset by M. Barthelemy[10] and ‘Castlewellan’, which originated from a single mutant tree in the Castlewellan estate arboretum in Northern Ireland.

  • However, their rapid growth (up to 1 m per year), their thick shade and their large potential size (often more than 20 m high in garden conditions, and they can reach at least
    35 m) make them problematic.

  • [4] Naylor commissioned Edward Kemp to lay out the gardens, which included redwoods, monkey puzzle trees and two North American species of conifers in close proximity to each
    other – Monterey cypress and Nootka cypress.

  • [24] In May 2008, UK resident Christine Wright won a 24-year legal battle to have her neighbour’s leylandii trees cut down for blocking sunlight to her garden.

  • Even on sites of relatively poor culture, plants have been known to grow to heights of 15 metres (49 ft) in 16 years.

  • A hardy, fast-growing natural hybrid, it thrives on a variety of soils, and sites are commonly planted in gardens to provide a quick boundary or shelter hedge, because of
    their rapid growth.

  • ‘[5] The hybrid has since arisen on nearly 20 separate occasions, always by open pollination, showing the two species are readily compatible and closely related.

  • [11] Description A large, evergreen tree, Cupressus × leylandii reaches a size between 20 and 25 m high, with its leaves giving it a compact, thick and regular habit.

  • However where the parents are treated as being in different genera, Leyland cypress becomes an intergeneric hybrid: if Nootka cypress is within Chamaecyparis, the name of
    the hybrid becomes ×Cupressocyparis leylandii, and where it is treated as Xanthocyparis, the hybrid becomes ×Cuprocyparis leylandii.

  • Leyland cypress trees are commonly planted to quickly form fence or protection hedges.

  • In California’s Central Valley, they rarely live more than 10 years before succumbing, and not much longer in southern states like Alabama.

  • Commercial nurseries spotted the plant’s potential, and for many years, it was the biggest-selling item in every garden centre in Great Britain, making up to 10% of their
    total sales.

  • It has become clear, however, that when the genus Cupressus is defined to include Chamaecyparis, it is paraphyletic unless it also includes Juniperus.

  • [6] He further developed the hybrid at his new home, and hence named the first clone variant ‘Haggerston Grey’.

  • [2] Their rapid, thick growth means they are sometimes used to achieve privacy, but such use can result in disputes with neighbours whose own property becomes overshadowed.

  • [15][16] It may be added that attempts to cross Nootka cypress with other Chamaecyparis species have been universally unsuccessful.


Works Cited

[‘Mark A. Garland; Gerry Moore (2012). “×Hesperotropsis, a new nothogenus for intergeneric crosses between Hesperocyparis and Callitropsis (Cupressaceae), and a review of the complicated nomenclatural history of the Leyland cypress”. Taxon. 61 (3): 667–670.
2. ^ John Hillier; Allen J. Coombes, eds. (2007). The Hillier Manual of Trees & Shrubs. David and Charles. p. 436. ISBN 9780715326640.
3. ^ “Plymouth neighbours row over 35ft trees”. BBC News. September 7, 2010. Retrieved
November 30, 2013.
4. ^ “Leighton Hall – A History”. Mid Wales. BBC. March 25, 2008. Archived from the original on October 6, 2011. Retrieved November 29, 2008.
5. ^ Jump up to:a b c d “Leyland cypress – × Cupressocyparis leylandii”. Royal Forestry
Society. Archived from the original on February 15, 2011. Retrieved November 30, 2008.
6. ^ Ian Whitehead (June 13, 2013). “”Turbinia” at speed – but who’s on the conning tower?”. Tyne & Wear Archives & Museums. Retrieved June 19, 2013. This examines
Charles Leyland’s connections with the sea and Northumberland.
7. ^ Armitage, James (2011). “The fertility of leyland cypress”. Plantsman (Lond.). 10: 254–256. Retrieved Feb 11, 2015.
8. ^ Yixuan, Kou; Huiying, Shang; Kangshan, Mao; Zhonghu,
Li; Keith, Rushforth; Robert, Adams (2014). “Nuclear and Cytoplasmic DNA Sequence Data Further Illuminate the Genetic Composition of Leyland Cypresses” (PDF). Journal of the American Society for Horticultural Science. 139 (5): 558–566. doi:10.21273/JASHS.139.5.558.
Retrieved Feb 11, 2015.
9. ^ Jump up to:a b “Cupressocyparis leylandii” Archived 2012-06-04 at the Wayback Machine zipcodezoo Accessed 9 March 2009
10. ^ “x Cuppressocyparis leylandii ‘Naylor’s Blue'” Archived 2009-04-29 at the Wayback Machine Accessed 9 March 2009
11. ^ Gerd Krüssmann (1995). Manual of Cultivated Conifers. Portland, Oregon: Timber Press. p. 101. ISBN 9780881920079.
12. ^ John Kelly, John Hillier (Hrsg.): Bäume & Sträucher. Thalacker, Braunschweig 1997, ISBN
3-87815-086-5, S. 256 – 257.
13. ^ Damon P. Little; Andrea E. Schwarzbach; Robert P. Adams; Chang-Fu Hsieh (2004). “The circumscription and phylogenetic relationships of Callitropsis and the newly described genus Xanthocyparis (Cupressaceae)”. American
Journal of Botany. 91 (11): 1872–1881. doi:10.3732/ajb.91.11.1872. PMID 21652334.
14. ^ Damon P. Little (2006). “Evolution and circumscription of the true cypresses (Cupressaceae: Cupressus)”. Systematic Botany. 31 (3): 461–480. doi:10.1600/036364406778388638.
JSTOR 25064176.
15. ^ Kangshan Mao; Gang Hao; Jianquan Liu; Robert P. Adams; Richard I. Milne (2010). “Diversification and biogeography of Juniperus (Cupressaceae): variable diversification rates and multiple intercontinental dispersals”. New Phytologist.
188 (1): 254–272. doi:10.1111/j.1469-8137.2010.03351.x. PMID 20561210. S2CID 4230729.
16. ^ Christopher J. Earle (ed.). “Cupressus Linnaeus 1753, p. 1002”. The Gymnosperm Database. Retrieved November 30, 2013.
17. ^ Robert R. Mill; Aljas Farjon
(2006). “Proposal to conserve the name Xanthocyparis against Callitropsis Oerst. (Cupressaceae)”. Taxon. 55 (1): 229–231. doi:10.2307/25065550. JSTOR 25065550.
18. ^ Jump up to:a b c Rhodri Clark (January 26, 2008). “Mother of all trees that sets
neighbours at war revealed to have its accidental roots in Wales”. Western Mail. Retrieved November 30, 2008.
19. ^ Dietrich Frohne; Hans Jürgen Pfänder (2005). Poisonous plants: a handbook for doctors, pharmacists, toxicologists, biologists and
veterinarians (2nd ed.). Timber Press. p. 155. ISBN 9780881927504.
20. ^ “TRACING GREEN GIANT BACK TO CASTLE ROOTS”. Northern Echo. 2000-07-21. Retrieved 2008-11-30.
21. ^ “RHS Plant Selector – × Cuprocyparis leylandii ‘Gold Rider'”. Retrieved
15 April 2020.
22. ^ “AGM Plants – Ornamental” (PDF). Royal Horticultural Society. July 2017. p. 22. Retrieved 24 January 2018.
23. ^ “RHS Plant Selector – Cuprocyparis leylandii”. Retrieved 9 June 2013.
24. ^ Jonathan Duffy (May 31, 2005).
“Fir extinguisher”. BBC News. Retrieved September 25, 2006.
25. ^ Richard Savill (May 17, 2008). “Leylandii dispute ends in light relief”. The Daily Telegraph. Retrieved December 30, 2009.
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