ABSTRACT 



First-year survival of four coniferous species, Douglas-fir 

 ( Pseudotsuga menziesii var. glauca (Beissn. ) Franco), Engel- 

 mann spruce (Picea engelmannii Parry), grand fir (Abies grandis 

 (Dougl. ) Lindl. ), and western larch (Larix occidentalis Nutt.). 

 was determined for 3 consecutive years in northern Idaho. Trees 

 were planted on three dates during the fall and on three dates 

 during the spring. Each planting was on both a north and a south 

 aspect to permit comparisons of differing moisture stress. Sur- 

 vival of spring-planted trees was generally better than that of fall 

 plantings. Fall planting results were more variable and appar- 

 ently more influenced by species, planting date, and aspect of the 

 planting site. Some probable causes for differences are dis- 

 cussed, together with practical implications to planting programs. 



