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.
Some types of pines grow 70 to 80 feet tall. Sometimes soaring to heights of over 50 feet, evergreen trees need plenty of space. The spread of a typical juniper (Juniperus) or arborvitae (Thuja) is 5 to 10 feet -- and these are backyard evergreens that mature at just 20 to 30 feet in height.