Can copper turn spruce trees blue?

Copper itself does not turn spruce trees blue, but it can affect the color of their foliage indirectly. When copper is present in high concentrations in the soil or water, it can lead to nutrient imbalances or toxicity, which may cause discoloration or stress in the trees. However, the blue coloration often associated with spruce trees is typically due to a waxy coating on their needles or other environmental factors, rather than copper exposure.