Blue Rug Juniper (Juniperus horizontalis 'Wiltonii') is a popular, low-maintenance evergreen ground cover known for its dense, silvery-blue foliage that grows 4–6 inches tall and spreads 6–8 feet wide. Ideal for erosion control on slopes and in rock gardens, it requires full sun, well-drained soil, and is drought-tolerant once established. It is hardy in zones 3-9, turns purple in winter, and grows at a moderate rate of 6–12 inches per year. 
 
Key Care and Characteristics 
Light: Needs full sun, ideally 6+ hours of direct sunlight daily, to maintain its dense, vibrant color.
Water: Drought-tolerant once established; only requires water during dry spells, though it needs consistent moisture for the first few months.
Soil: Highly adaptable to various soil types, including dry, rocky, or sandy soil, provided it is well-drained.
Size: Grows only 4-6 inches high but spreads 6-8 feet wide.
Growth Rate: Slow to moderate, generally 6–12 inches of spread per year.
Uses: Excellent for ground cover, erosion control, container planting, and trailing over retaining walls.
Hardiness: Extremely hardy, surviving down to -30∘F