Calocedrus decurrens (Torr.) Florin

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Article from Bean's Trees and Shrubs Hardy in the British Isles

Recommended citation
'Calocedrus decurrens' from the website Trees and Shrubs Online ( Accessed 2021-09-26.


  • Libocedrus decurrens Torr.
  • Heyderia decurrens (Torr.) K. Koch
  • Thuja gigantea sens. Carr., not Nutt.


Lying flat against an object.
Small branch or twig usually less than a year old.
(of a tree or shrub) Narrow in form with ascending branches held more or less parallel to the trunk.


Article from Bean's Trees and Shrubs Hardy in the British Isles

Recommended citation
'Calocedrus decurrens' from the website Trees and Shrubs Online ( Accessed 2021-09-26.

Editorial Note:

Although this species is now placed within the genus Calocedrus, Bean continued to discuss it under Libocedrus decurrens in the eighth edition (Bean 1976). The text is copied here:

A tree 125 to 150 ft high in the wild, with a trunk occasionally 7 ft in diameter. Numerous trees between 50 and 70 ft high are to be found in this country, all marked by a stiff columnar or narrowly pyramidal habit. The branches are erect, and have their branchlets and leaves set vertically or edgewise instead of horizontally, so that they are equally exposed to the light on both sides, and are uniformly green on both surfaces. Leaves in four rows and in opposite pairs; about 18 in. long, free only at the sharp points, the lower part appressed to and completely covering the branchlet, dark glossy green. Cones erect, 34 in. long 14 to 13 in. wide at the base, tapered. Seeds four, 13 in. long, awl-shaped, with a large wing on one side and a small one on the other.

Native of Oregon and California; introduced by Jeffrey for the Oregon Association of Edinburgh in 1853; discovered seven years previously by Col. Frémont. It was frequently called Thuja gigantea in gardens, but is quite distinct from the tree to which that name properly belongs, whose horizontally spreading branchlets showing white stomata beneath are quite different (see Thuja plicata).

Calocedrus [Libocedrus] decurrens grows rather slowly, but is perfectly hardy and should be represented in every garden large enough to accommodate it, because of its distinct and formal shape – admirable for a group planted as Lombardy poplars sometimes are. A very fine tree measuring 99 × 1512 ft (1966), and quite columnar, is in the Royal demesne of Frogmore. It is an original from the 1853 introduction and was planted in 1857. The tree at Eastnor Castle of which the dimensions are given below is also of the original introduction and like the Frogmore tree has retained a dense, columnar habit. In Italy the branches are more spreading and the tree more broadly pyramidal than is usual with us, and in this respect they resemble the wild trees, which may be slender-crowned, especially when young, but are never closely fastigiate. Whether environmental or genetic factors are responsible for this difference is not known. Alan Mitchell has noted that trees in Ireland are broader than in England, and broader still in western Ireland. For a discussion on this matter see Qtly. Journ. For., Vol. 56 (1962), pp. 78–80.

In addition to the Frogmore tree mentioned above, the following other notable specimens have been recorded recently:

Tittenhurst Park, Ascot, Berks., 116 × 1112 ft (1963); Lythe Hill, Haslemere, Surrey, 110 × 1212 ft (1963); Westonbirt, Glos., 97 × 1034 ft (1966); Eastnor Castle, Heref., 100 × 1614 ft (1961); Broxwood Court, Herefi., 111 × 1014 ft (1957); Oakley Park, Ludlow, Heref., 117 × 912 ft (1960); Bicton, Devon, from original introduction, 88 × 1214 ft (1957); Fota, Co. Cork, Eire, from original introduction, 82 × 1214 ft (1966).

From the Supplement:

specimens: Lythe Hill, Haslemere, Surrey, 114 × 1212 ft (1977); Heckfield Place, Hants. 85 × 1334 ft (1982); Nuneham Courtney, Oxon., 102 × 1234 ft (1983); Westonbirt, Glos., 108 × 1112 ft (1980); Eastnor Castle, Heref., 98 × 1634 ft at 4 ft (1977); Broxwood Court, Heref., 115 × 1114 ft and 98 × 1112 ft (1975); Killerton, Devon, 105 × 1114 ft (1983); Bodnant, Gwyn., pl. 1902, 82 × 1134 ft (1981); Doune House, Perths., 123 × 1734 ft and 102 × 1512 ft (1980); Ballindarroch, Inv., 80 × 1614 ft (1982); Achnagarry, Inv., 95 × 16 ft at 2 ft (1982).