Experimental study evaluates seed treatments and planting strategies for optimizing western larch germination and seedling survival.
A 3-year experiment to determine feasibility of spot seeding western larch in spring yielded information on favorable aspect and dates for planting, effectiveness of two seed treatments in increasing germination, and means for preventing loss to rodents. Sowing stratified seed on bare soil on north-facing slopes soon after snow-melt produced best germination and survival. Seed soaked in hydrogen peroxide and seed that had no pretreatment germinated poorly. Seedling survival was low on south-and west-facing slopes regardless of seed pretreatment. Drought, insolation, frost heaving, and fungi caused most seedling mortality. Losses to rodent depredations were insignificant and hardly justified use of control measures.
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Shearer et al. (1967) studied this question.
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