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Western Larch (Lw)

The rapid initial height growth of Lw, and its resistance to Armillaria, makes it an attractive alternative to Fdi for many reforestation projects in the southern interior. The same characteristics make it attractive as an exotic species in the coast-interior transition. Although the species is more drought-tolerant than Fdi/Fdc, it is not as drought-tolerant as Pli/Py.

It is important to remember that good site preparation, such as scarification, is essential for any larch plantation because of the sensitivity of the species to vegetation competition, even after the first few years following planting. Careful attention should be given to planting spot selection in order to avoid shading. On sites where a mixed planting or under planting has been prescribed, it may be more cost-effective to use a larger stock type.

The major limiting factors that Lw stock type selection can address are vegetation competition and animal damage.

Although less so than Fdi, Lw grows vigorously in the nursery and therefore should never be ordered as 2+0 stock.

Lw may have poor cohesion in the upper part of the plug. It is not recommended as a summer stock type due to difficulties in promoting and maintaining budset.

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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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Sowing Trends ­ 1993/1998
Species:   Western larch (Lw)

  1993 1998

% of total sowing of Lw
     1 + 0
     BBR/PBR
     Copper treated
99
0
0
100
0
3
# of stock types 5 9
Dominant container types 313B 410/313B/415B
Smallest container type 310B 310B
Largest container type 415D 615A
Quantity sown (K) 3149 5008.9

New stock types since 1993:  412A/313D/512A/PCT

Pie graph showing Lw stock type profile, 1998 sowing.


Plate 28.   Lw stock types. Photograph taken in the fall; seedlings are starting to shed their needles. (Arrowheads indicate target heights.)

Lw stock types.


Lw stock type suitability.

Lw Limiting factors
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spacer graphic Season Vegetation
competition
Snow-
press
Animal
damage
Drought Shallow
soils

Recommended stock types:
PSB 313B 1+0 Sp Poor Poor Poor Poor Fair
PSB 410 1+0 Sp Fair Fair Fair Fair Good
PSB 415B 1+0 Sp Fair Fair Fair Fair Poor
PSB 412A 1+0 Sp Good Good Good Fair Good
PSB 415D 1+0 Sp Good Good Good Poor Poor
PSB 512A 1+0 Sp Good Good Good Fair Good
PSB 515A 1+0 Sp Good Good Good Poor Poor
PSB 615A 1+0 Sp Good Good Good Poor Poor


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