An example of dia used as a prefix is in the word diagnosis, which means a thorough analysis of a disease. dia- through, throughout, across: diachronic, diagram
Blue spruce evergreen trees (Picea pungens) grow wild in Western North America in U.S. Department of Agriculture plant hardiness zones 3 through 8. This erect tree produces blue-green evergreen needles that are sharp to the touch. Blue spruces reach 30 to 65 feet tall, spreading 10 to 20 feet wide. With good care this slow-growing tree can grow up to 12 inches per year. Blue spruce trees grow well as showcase trees or as part of a windbreak. Examine the location of the blue spruce tree while it is still young enough to transplant.
'Fat Albert' Colorado blue spruce (Picea pungens 'Fat Albert,' USDA zones 3 through 7) grows about 12 inches per year, reaching a height of 10 feet and width of 7 feet in 10 years. Its mature size is 10 to 15 feet tall and 7 to 10 feet wide.