An evergreen tree of plantations, especially on wetter ground, in high rainfall areas and in exposed sites. It regenerates freely in open ground, in areas of clear felling, and on Calluna heath. 0-690 m (where it has been reported as regenerating near Stuc a` Chroin, W. Perth), and probably higher.
Introduced in 1832, P. sitchensis is now the most frequently planted conifer in our area, dominating huge areas of former moorland and bog. However, it is now being planted more often at lower altitudes. It was known from the wild by 1957.
Native of coastal forests in western N. America; widely planted in N.W. & C. Europe.
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Light (Ellenberg): 7
Moisture (Ellenberg): 7
Reaction (Ellenberg): 2
Nitrogen (Ellenberg): 2
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.2
July Mean Temperature (Celsius): 14.1
Annual Precipitation (mm): 1223
Height (cm): 5500
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 1144
Count of 10km squares in Ireland: 215
Count of 10km squares in the Channel Isles: 1
Weighted Changed Factor: 61
Weighted Change Factor Confidence (90%)
Atlas text references
1984. Exploited plants. Sitka spruce. Biologist. 31:255-261.
1968. Flora of Alaska and neighboring territories.
1982. The Forester's Companion.
1999. The potential for natural regeneration of conifers in Britain. Forestry Commission Bulletin no. 120.