Forest Research has recently examined some long-term experiments to examine provenance variation of emerging species.  Individual reports for the species covered so far can be found here. The table at the bottom of this page is a summary of how the results compare with Forestry Commission Bulletin 66, which only included four of the species.

• The summary for each species should be considered along with the full results as the detail can be important.
• FC Bulletin 66 was generally based on early results from the trials; in the recent work the experiments were much older but unfortunately not all of the trials had survived.
• Recent work has analysed the results with the objective of providing guidance on the best region for seed collections in the current climate. The method of analysis used to support FC Bulletin 66 was to compare individual provenances with each other and use this as a basis for making recommendations.
• These are the first results published in Britain for European silver fir, Pacific silver fir, Low’s fir, Japanese red cedar, coast redwood and red oak.
• Only the western hemlock experiments contained provenances from Britain and most of the reports suggest testing home provenances should be a priority for future work.