Look for a slow-release fertilizer labeled for pines or evergreens. Most soils have sufficient phosphorus although you need a soil test to confirm this. You are mostly looking for a nitrogen source and a bit of potassium. Several inches of rich compost would do. Here is an article from Univ of Minn Extension Service: https://www.extension.umn.edu/garden/yard-garden/trees-shrubs/fertilizing-evergreens-conifers/
Answered on January 9, 2018
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