Fertilize Colorado (Blue) Spruce
Colorado blue spruce (Picea pungens) grow mainly in USDA plant hardiness zones 2 through 5. In addition to full sun and moist soil, Colorado blue spruce trees benefit from a little fertilization. It is important to know when to fertilize your spruce trees as it can be harmful to fertilize them during the first year after planting.
Instructions
1. Measure the height of your Colorado blue spruce tree. You need this measurement to determine how much fertilizer to use.
2. Multiply the height of the spruce tree by 1/3 lb. For example, if your spruce tree was 12 feet tall, you would need 4 lbs. of fertilizer. A spruce tree that measured only 9 feet in height would require 3 lbs. of fertilizer.
3. Dig several 15 inch holes around the base of your Colorado blue spruce. Make sure none of these holes touch the tree's roots.
4. Pour the fertilizer in the holes evenly, and cover the holes back up with the soil you removed.
5. Water the area until the soil is moist but don't over water. Spruce trees can withstand a drought but not a flooding.
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