How to Make a Blue Spruce Blue

Blue spruce (Picea pungens) is a pyramidal evergreen tree known for its attractive blue needles. Native to the Western United States, blue spruce performs best in USDA Plant Hardiness zones 2 through 7, where they are often used as privacy screens, windbreaks or landscape specimens. Though blue spruce are low-maintenance trees, there are a few things you can do to make sure your tree's foliage stays as blue and beautiful as possible.

Frequent irrigation helps keep foliage healthy and blue.

Step 1

Select a blue spruce cultivar know for its intensely blue foliage. These include Picea pungens "Bakeri," "Hoopsi," "Moerheim" and "Fat Albert."

Step 2

Plant your blue spruce in a full sun location with moist, fertile, well-draining soil. Select a site that receives direct sunlight for a minimum of six hours a day to ensure the tree retains its attractive blue coloring. Plant the tree at the same depth it was growing in its nursery pot.

Step 3

Irrigate the blue spruce regularly to maintain moist soil; frequent irrigation helps keep the foliage healthy and blue. Drought-stressed trees may suffer from unsightly faded or browned foliage. For best results, provide the tree with 1 inch of supplemental irrigation per week during the spring and summer.

Step 4

Fertilize the blue spruce three times a year to provide nutrients for healthy growth and development. Feed the tree with a granular 12-12-12 fertilizer in April; apply subsequent applications at the beginning of June and August. Use the fertilizer according to instructions on the product label.

Step 5

Prune any discolored, diseased or dead foliage from your blue spruce tree, as needed, to keep it healthy and attractive. Use sharpened and sterilized pruning shears or loppers.