Juniper is a great plant for filling in space fast, whether as a groundcover, a screen, or vertical punctuation in a border. Its scaly foliage is feathery and graceful, a good contrast to large-leaf plants. For low-water or rock gardens, the low-growing juniper forms a naturalistic mat that often acquires richer color in the winter. Juniper thrives in a full-sun site in well-drained soil. Most varieties are drought-tolerant once established.