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Climate change increases the likelihood of extreme weather events and the risk of damage to seedlings. At the same time, forest growth and thus carbon sequestration should be increased to mitigate climate change. A decrease in the number of forest workers requires an extension of the planting season from the traditional spring to fall. These changes in the operating environment can also affect root growth and early performance of seedlings. Granular arginine phosphate has been developed to improve root growth of tree seedlings and may be a potential tool to improve field performance of seedlings after planting. The aim was to study the effects of arGrow® Granulat (ARG) on the field performance of Norway spruce (Picea abies (L.) H. Karst.) and Scots pine (Pinus sylvestris L.) seedlings planted at different planting dates and under different site conditions in boreal forests. Container seedlings were planted in …