'Blue Chip' is a cultivar of J. horizontalis, and has a low, prostrate habit, growing less than a foot high, but spreading 6 to 8 feet. It has silver-blue foliage which holds during the winter months. It is useful on slopes, as a large area groundcover, or draped over walls. Have also seen it in nurseries propped up on a stake, to make some sort of mounding-thing.
Grow in any soil that is well draining, including sandy, gravelly, or clay soils, but they must be well draining. Best growth in full sun. Once established, it tolerates dry soils and heat. Avoid shearing, as that will made the juniper woody and stiff; instead, prune selectively if necessary (see Guides).