There are so many varieties of juniper that grow in the Tucson area, that it would be hard to cover them all in one article. There are tree, shrub and ground cover varieties available. Although there are several varieties of juniper that are native to the mountains of Southern Arizona, growing them in the desert is a bit challenging as they attract red spider mites by the hoards. This can be fatal if left untreated, so if you have (or want) juniper, just keep that in mind.
Here are just a few varieties:
Juniperus horizontalis ‘Wiltonii’ (Blue Rug Juniper) This is a very low growing variety (about 4 to 6 inches tall) that spreads from 6 to 8 feet wide. The leaves are very silvery blue-green (thus the name Blue Rug). It tolerates heat.
Juniperus chinensis ‘Sea Green’ is a moderate size shrub, growing to about 4 to 5 feet tall and wide. The branching is more arched, which works best in a non-hedge situation.
Juniperus chinensis ‘Columnaria’ (Chinese Blue Column Juniper) is a columnar variety, with blue green leaves and a narrow cone shape. It grows from 12 to 15 feet tall and 6 feet wide.
Reference: Sunset Western Garden Book; Sunset Publishing Corp. 2001