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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comIn your article, you suggest applying 12-12-1 fertilizer at various times! You do not say how much, and you don’t give any sources for 12-12-1 fertilizer.
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[1] https://www.extension.umn.edu/garden/yard-garden/trees-shrubs/fertilizing-evergreens-conifers/: https://www.extension.umn.edu/garden/yard-garden/trees-shrubs/fertilizing-evergreens-conifers/
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1 Comment To "Blue Spruce Trees"
#1 Comment By MichiganDot On 01/08/2018 @ 7:46 pm
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/ [1]