The guidance considers issues such as thinning regimes, rotation length, growth rate, and economic factors such as the premium paid for rooted cutting stock at the time of planting versus the likely premium for green logs at harvest.
More than 90 per cent of the Sitka spruce planted in Britain today is from British ‘improved’ planting stock.
This is predicted to produce around 25 per cent more timber at final rotation, compared with stock from the Pacific North West. Forest managers can choose improved stock from either seedlings raised from seed or rooted cuttings.
"Choosing Sitka spruce planting stock" is available to download for free from Forestry Commission publications.