Picea pungens
<https://upload.wikimedia.org/wikipedia/commons/6/62/Picea_pungens-Glauca_globosa-Malochyn%C4%9B.jpg>
Common Name —— Colorado spruce; blue spruce
Family —————— Pinaceae
Hardiness Zone —— 2 – 7
Form ——————— upright tree
Height/Spread ——– 9 – 18 m / 3 – 6 m
Water ——————– medium
Soil ———————– moist; well-drained; acidic
Sunlight —————- full sun
Leaves —————— sharp; blue-green; 4-sided needle; mark on branchs
Cone ——————— similar to Douglas’ fir, but without bracts
Limitation ————- prone to aphid; not suitable to hot and humid climate; over-fertilizing makes it weak
Strength —————- tolerate to drought and air pollution
Use ———————– as specimen plant
ID ———————— spiky touch; 4-sided blue-green needle; mark on branchs
