They aren't the tradtional long, slender needles like you see on pines or spruce. Some varieties have both the scale-like and the prickly forms of needles and other varieties have just one form. Bachman's divides junipers into two catagories. They are grouped as spreaders and uprights. Spreaders all grow wider than they do tall.
Some spreaders are almost global in form, growing evenly wide and tall.
Uprights grow much taller than they are wide. Most of the good landscape varieties of junipers are hardy in zones 3 and 4. One variety, Grey Owl, is hardy to Zone 2. There are other varieties hardy to Zone 2, but none that we sell. Junipers are easy to grow when you meet their few basic needs.