Images Depict Mature Plants
Blue Rug Juniper
Juniperus horizontalis 'Wiltonii'
Blue Rug Juniper is one of those plants that earns its keep fast. It covers ground, holds great color, handles tough sunny spots, and helps solve slope and erosion issues without needing much once it gets established.
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Silver-Blue Evergreen Coverage for Slopes, Borders, and Rock Gardens
A groundcover that solves real landscape problems beautifully
Blue Rug Juniper is an excellent choice for homeowners who want an evergreen groundcover that does more than just fill space. Its low, spreading habit helps cover bare ground quickly, soften hard edges, and create a finished look in places where turf, perennials, or larger shrubs may struggle. This is the kind of plant that brings practical coverage and ornamental value at the same time.
Silvery-blue foliage keeps the landscape bright all year
One of the biggest reasons Blue Rug Juniper stands out is its foliage color. The plant forms a dense mat of silver-blue evergreen growth that brings cool-toned contrast to the landscape in every season. In winter, that color may take on a slightly purplish cast, which adds another layer of seasonal character without losing the plant’s value as a groundcover.
Its creeping habit makes it excellent for erosion control
Blue Rug Juniper stays very low to the ground, but it spreads broadly over time. That growth habit makes it especially useful on banks, slopes, and other hard-to-maintain areas where erosion control and weed suppression are important. It also works beautifully spilling over retaining walls or edging the front of sunny planting beds.
Perfect for rock gardens, borders, and large sunny spaces
This juniper is especially effective in rock gardens, gravel gardens, sunny slopes, border fronts, and large mass plantings where a broad carpet of evergreen texture is the goal. It also fits naturally into coastal and waterwise landscapes, where its salt tolerance and drought tolerance add practical value along with ornamental appeal.
Tough, drought tolerant, and easy to maintain
Blue Rug Juniper performs best in full sun and sharply drained soil. Once established, it is notably drought tolerant and generally low maintenance, needing very little pruning beyond occasional cleanup or light shaping. Deer resistance is widely cited for this plant, but as with any landscape shrub, it is best described as relative rather than absolute in areas with heavy browsing pressure.
| Hardiness Zone: | 3-9 |
|---|---|
| Mature Height: | 4 to 6 inches |
| Mature Width: | 4 to 6 feet |
| Sunlight: | Full Sun |
| Soil | Well-drained soil; acidic to slightly alkaline and adaptable to sandy or lean soils |
| Water | Moderate during establishment; drought tolerant once established |
| Bloom Time / Color | Conifer; grown for foliage, not flowers |
| Foliage | Silvery-blue foliage, sometimes with purplish winter tones |
| Ornamental Features | Dense carpet-like habit, dramatic foliage color, trailing growth |
| Wildlife ValueWildlife Value | Evergreen cover value; occasional berry-like cones may benefit birds |
| Resistance (deer/disease/drought/etc.) | Relatively deer resistant, drought tolerant, salt tolerant, coastal tolerant, low maintenance |
| Landscape Uses | Ground cover, slopes, erosion control, rock gardens, cascading over walls, border edging, mass plantings |
How to Care for Blue Rug Juniper
Be sure to read our planting instructions to ensure a healthy and happy Blue Rug Juniper for years to come!
How should I plant Blue Rug Juniper?
Plant Blue Rug Juniper in full sun and sharply drained soil. Dig a hole about twice as wide as the root ball and no deeper than the root ball itself, then set the plant so the top of the root ball sits level with or slightly above the surrounding soil. Backfill with the native soil, water deeply, and mulch lightly around the base while keeping mulch off the stems. If you are planting Blue Rug Juniper on a slope or in a mass groundcover area, spacing the plants with future spread in mind will help them knit together into a dense evergreen carpet over time.
How often should I water Blue Rug Juniper after planting?
Water Blue Rug Juniper deeply right after planting, then keep the soil evenly moist during the first growing season while the roots establish. In most sunny landscapes, that means watering about once per week, with extra attention during extended heat or drought. Once established, Blue Rug Juniper becomes quite drought tolerant and generally needs much less supplemental water. Overwatering is much more likely to cause trouble than slightly dry soil, so the real key is good drainage and avoiding constantly wet conditions.
When should I fertilize Blue Rug Juniper?
Blue Rug Juniper usually needs very little fertilizer. If needed, a light feeding in early spring with a balanced slow-release fertilizer for evergreens is enough to support healthy new growth. Avoid heavy fertilizing, since that can encourage unnecessary soft growth and is rarely needed for a plant that naturally performs well in leaner soils. In most cases, full sun and proper drainage matter far more than aggressive feeding.
When and how should I prune Blue Rug Juniper?
Prune Blue Rug Juniper only lightly and only when needed, usually in late winter or early spring. Remove any dead or damaged growth first, then make small shaping cuts if the plant needs tidying or if branches have extended beyond the desired edge. Avoid cutting deeply into old interior wood, since junipers do not reliably push new growth from bare older stems. In most cases, Blue Rug Juniper looks best when pruning is limited to cleanup and gentle control rather than heavy shaping.
