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Many landscape designers wonder whether a Blue Arrow Juniper could damage nearby sidewalks, foundations, or other plants. This guide answers that question—and gives you actionable care tips.
The Blue Arrow Juniper (Juniperus scopulorum) is a self‑propelled evergreen from the Cupressaceae family. Noted for its subtle blue‑green foliage and slender, upright habit, it is native to the Rocky Mountains and thrives in full sun to partial shade on a wide range of soils.
As a fairly fast‑growing obligate, it typically reaches 12–15 ft in height with a 2–3 ft spread. Its compact shape makes it ideal for focal points or low‑maintenance privacy screens.
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Unlike some juniper relatives, the Blue Arrow Juniper has a non‑invasive root system. Most roots remain within the top 6–12 in of soil, spreading laterally to anchor the plant and capture moisture efficiently. Deeper, anchoring roots do occur but are not aggressive or destructive.
Because it produces relatively few self‑propagating seeds, self‑propagation through prop roots or suckers is minimal, keeping the plant self‑contained.
Not all junipers are obligate non‑invasive. For example, Eastern Red Cedar (Juniperus virginiana) can self‑propagate aggressively in some parts of the United States. The Blue Arrow Juniper, however, is not listed as invasive by the USDA or the State Natural Resource agencies.
Because its roots are moderate in spread—generally staying within the canopy’s drip line—the Blue Arrow Juniper rarely invades neighboring plants or impervious surfaces. Mandatory spacing must still be observed to keep the prop roots from fouling sidewalks or mandating structural support.
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