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The following section outlines the stock types for British Columbia. There are several general guidelines that should be followed:

  • PSB 2+0 Sp stock types are not recommended for any species except Ba and Bl. Substitute larger 1+0 stock types or use 2+0 Su stock types.
  • PSB 211A 1+0 stock types are generally not recommended. Substitute PSB/PCT 313B 1+0 or larger stock types.
  • PCT stock types are recommended for Pli and Py.
  • Substitute PSB/PCT 313B stock types for PSB/PCT 313A.

The relative appropriateness of stock types and their applicable planting season are described for each species in relation to the major limiting factors. Those stock types that have not been listed are either not appropriate for that species or are suitable only under limited circumstances.

The recommended stock types listed in the tables, and the relative suitability of the different stock types, in terms of survival and initial growth, have been classed under three categories:

  • POOR: stock types that are not suited for a particular limiting factor.
  • FAIR: stock types that have some suitability for a particular limiting factor, although only low levels of the limiting factor can be tolerated by these stock types.
  • GOOD: stock types that have some suitability for moderate levels of particular limiting factors. For the most extreme levels of these limiting factors use the largest stock type.

Plate 19 indicates the range of variation that can be expected between and within nurseries. There can be considerable variation between seedlots and/or nurseries from year-to-year. Some of the variation is stock type dependent. For example, 1+0 Sx stock types are typically more uniform compared to 2+0 Sx. However, Bl stock types are more variable as 1+0 than as 2+0.

Consideration was given to height, root collar diameter, foliage colour, branching, and plug cohesiveness in selecting representative samples for the photographs of stock types by species. Stock types were selected based on the 1997 sowing statistics. A standard 5 x 5 cm reference grid was used in every plate. Target heights based on 1997 morphological specifications have been noted.

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Spruce (Sx)

Lodgepole Pine (Pli/Plc)

Western Redcedar (Cw)

Coastal Douglas-fir (Fdc)

Interior Douglas-fir (Fdi)

Sitka Spruce (Ss and Sxs)

Western Larch (Lw)

Western White Pine (Pw)

Yellow Pine (Py)

Subalpine Fir (Bl)

Amabilis Fir (Ba)

Noble Fir (Bn)

Grand Fir (Bg)

Western Hemlock (Hw)

Mountain Hemlock (Hm)

Yellow-cedar (Yc)

Hardwoods

Native Shrubs

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Plate 19.   Variation of Sx stock types within and among nurseries. Pairs of seedlings are from the same nursery illustrating little within-nursery variation, and greater between-nursery variation. The six seedlings on the left are Sx PSB 410 1+0; the six on the right are Sx PSB 415D 2+0. Note variation in plug cohesiveness, seedling height, stem diameter, and branchiness.

Variation of Sx stock types within and among nurseries.


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