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In page Tree planting:

"

Conceptually and logistically, the simplest way of extending the conventional planting season is to extend lifting and planting of fresh stock through summer until the planting program has been competed. Summer planting has also been successful in a number of research studies with white spruce, e.g., Crossley 1956;[1] Ackerman and Johnson 1962;[2] Decie 1962 cited by Revel and Coates 1976;[3] Burgar and Lyon 1968;[4] Mullin 1971,[5] 1974;[6] Revel and Coates 1976.[3] Success depends on minimizing stresses to planting stock at all stages from lifting through planting and on planting when site conditions are conducive to survival and growth.[citation needed]