Plot 1 –  Brechfa Forest Garden.

Botanical name        Pseudotsuga menziesii

Common Name         Douglas Fir

The Douglas fir (Pseudotsuga menziesii) is an evergreen conifer species in the pine family,   It is native to western North America and is also known as Douglas-fir,Douglas spruce, Oregon pine, and Columbian pine.

There are three varieties: Coast Douglas-fir (P. menziesii var. menziesii), Rocky Mountain Douglas-fir (P. menziesii var. glauca) and n Douglas fir (P. menziesii var. lindleyana).

Despite its common names, it is not a true fir (usgen Abies), spruce (genus Picea), or pine (genus Pinus). It is also not a hemlock; the genus name Pseudotsuga means “false hemlock”.

Summary of trial plot 39 years after planting.

provenance                    stocking                              health at 40 years                           comments

Washington                        average                                   good                                       tall but not best origin.


cumulative basal                                      top height,                                                    general yield class
-area production,

63.4                                                          32.3                                                                  26

Note that, in these plots, top heights were assessed after one growing season more than the basal areas.

Comparison of General Yield Class in species plots at Brechfa with other published  Welsh or British data.

Brechfa                                   Other

26                                     18:12-22  Source Aldhous and Low, 1974;

Notes of 4/11/2009   


Notes of 22/08/2018

Trees fairly tall and thin with sparse foliage higher up. Otherwise ok

Useful links


Woodland Trust

Conifer Database

RHS Gardening