Canadian Forest Service Publications
Rooting studies of western hemlock cuttings. 1975. Brix, H.; Barker, H. Environment Canada, Forestry Service, Pacific Forest Research Centre, Victoria, BC. Information Report BC-X-131. 14 p.
Issued by: Pacific Forestry Centre
Catalog ID: 1584
Rooting studies of western hemlock cuttings are described and recommendations are made in regard to selection of cutting material, time of collection, storage, preparation of cuttings, auxin treatment, fungicides, rooting medium, humidity control and temperature regime. The seasonal pattern of rooting, variation in rootability, and treatment, growth and flowering of rooted cuttings are discussed.
Cuttings generally rooted well when collected in the period from mid-October to mid-February, treated with a 24 hr basal soak in a solution of 100 ppm IBA and 150 ppm Benlate, placed in a rooting medium consisting of equal volumes of fine peat moss, coarse sand and coarse perlite, kept at high humidity in an enclosure of clear plastic shaded from direct sunlight, and given no heating of air or soil.
In one program, cuttings are collected from 128 trees in 13 plus stands, 42 years of age or older. By using an average of 35 cuttings per tree, rooted cuttings were produced from 117 of the 128 trees, with an average rooting per cent of 43.
Growth performance following rooting has been satisfactory, although plagiotropic growth form is still retained for about a third of the ramets 6 years after rooting. Seed cones were produced 1 year after rooting on many clones, and pollen cones in the fourth year on some clones.