Crimson Sentry Maple

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Vertical Purple Drama for Tight Minnesota Yards Crimson Sentry Maple (Acer platanoides 'Crimson Sentry') packs the rich, deep-purple foliage of a Crimson King into a narrow, uprigh t column just 12–15 feet wide. At a mature 20–25 feet, it delivers bold season-long color and vertical structure where a spreading shade tree would never fit. Like other Norway maples it's tough — adaptable to clay, compacted, and urban soils — and reliably hardy through USDA zone 4. Whether you want a striking accent in a Minnetonka entry bed, a slim street tree in St. Louis Park, or a vertical purple statement in a Bloomington courtyard, Crimson Sentry brings the drama in a small footprint. Crimson Sentry Maple Plant Details Attribute Detail Scientific Name Acer platanoides 'Crimson Sentry' Common Names Crimson Sentry Maple, Columnar Purple Norway Maple Mature Height 20–25 feet Mature Width 12–15 feet — narrow, upright column Growth Rate Slow to moderate — about 1–1.5 feet per year in Minnesota Sun Full sun (6+ hrs) — full sun gives the richest purple foliage color Water Moderate. Tolerates average rainfall once established; quite adaptable to dry spells. USDA Zones 4–8 (Twin Cities is zone 4b–5a) — very cold-hardy Soil Very adaptable — tolerates Minnesota clay-loam, compacted, and urban soils. Prefers well-drained loam but handles tough sites. Foliage Deciduous — deep purple all season; yellow spring flowers Fall Color Purple-bronze Winter Hardiness Reliably hardy through USDA zone 4 — proven in Twin Cities winters Deer Resistance Moderately deer-resistant; protect the trunk from buck rub the first 2 winters Native Status Not native — native to Europe. A tough, adaptable ornamental; its narrow form keeps its dense shade contained, but place it where you don't need lawn directly beneath. Crimson Sentry Maple Uses in Minnesota Landscapes Narrow Purple Accent for Tight Spaces At just 12–15 feet wide, Crimson Sentry fits a narrow side yard, a small front bed, or a tight urban lot while still delivering bold, season-long purple color. It's one of the few purple-leaf maples slim enough for confined spaces. Vertical Focal Point Its strong, narrow column makes a dramatic statement flanking an entry, marking the corners of a formal bed, or providing a dark backdrop for lighter foliage and flowers in a Twin Cities landscape. Slim Street and Boulevard Tree Tough enough for urban soil and compact enough for narrow rights-of-way, Crimson Sentry works as a street-side accent. Keep it back from the heaviest direct road-salt spray for best appearance. Best Time to Plant Crimson Sentry Maple in Minnesota Plant in spring (late April–May, after the ground thaws) for a full season of root establishment, or in early fall (late August–early October) while the soil is still warm. Get it in the ground at least six weeks before the ground freezes — typically mid-November in the Twin Cities. Avoid mid-summer planting in heat and humidity, and never plant after mid-October or before spring thaw. How to Plant Crimson Sentry Maple Dig wide, not deep — 2–3x the root ball width but only as deep as the ball is tall, so the root flare sits at or slightly above grade. Check for clay hardpan — if water pools and won't drain, break through the clay layer or mound-plant slightly to improve drainage. Backfill with the native soil mixed with 20–30% compost; don't build a pure-compost "container" the roots won't grow beyond. Spacing — give a single accent 12–15 feet of clearance; keep it away from spots where you want lawn directly beneath, since Norway maples shade and root densely. Build a 3–4 inch watering ring to direct water to the roots, then flatten it before winter so it doesn't trap ice. Mulch with 2–3 inches of shredded bark or wood chips in a wide ring, kept 2 inches off the trunk. Never use gravel mulch in Minnesota — it doesn't insulate roots. Watering Crimson Sentry Maple in Minnesota First Year Watering Schedule Weeks 1–2: water deeply and slowly every 1–2 days. Month 1–2: every 3–4 days. Month 3–6: every 5–7 days during active growth, easing off when rainfall is adequate (the Twin Cities average about 3 inches a month from June through August). Stop watering 2–3 weeks before the ground freezes — usually late October — so the tree doesn't push tender growth heading into winter. After Year One Once established, Crimson Sentry is very low-maintenance and quite drought-tolerant, needing supplemental water mainly during extended droughts (two-plus weeks with no rain and temps above 80°F). Soak deeply every 7–14 days when needed. Will Crimson Sentry Maple survive a Minnesota winter? Yes. It's a Norway maple rated to USDA zone 4 and is reliably hardy in Twin Cities winters. Wrap the young trunk the first winter to prevent sunscald and buck rub. Will the purple color last all summer? Yes. Crimson Sentry holds rich, deep-purple foliage from spring through fall, finishing purple-bronze. Color is deepest in full sun — too much shade can dull it toward green. How wide does it really get? It stays narrow — about 12–15 feet wide — which is exactly why it's so useful for tight lots. Plan for that width near walls, but it won't sprawl like a standard maple. Is it native to Minnesota? No — Norway maple is native to Europe. It's a tough, adaptable ornamental; its narrow form keeps its dense shade contained, but place it where you don't need lawn directly underneath. Does it tolerate clay and urban soil? Yes — exceptionally well. Norway maples handle compacted, clay, and tough city soils better than most trees, which makes Crimson Sentry reliable on hard urban lots. You May Also Like Royal Red Norway Maple — the same dramatic purple foliage on a full-size, broad-canopy tree. Columnar Norway Maple — a tough, narrow green-leaf columnar maple with yellow fall color. Armstrong Gold Red Maple — a slim, columnar red maple with golden-orange fall color. Red Rocket Maple — a narrow, upright red maple with bright red fall color. Emerald Lustre Norway Maple — a tough green-leaf Norway maple with golden fall color. How Many Crimson Sentry Maple Do I Need? Crimson Sentry works best as a vertical accent rather than a hedge. Plant a single column as a focal point in an entry bed, or a matched pair flanking a door or driveway spaced 15+ ft apart. For a formal rhythm along a long drive or property line, repeat trees every 14–16 ft — the 12–15 ft crowns will just touch for a stately purple colonnade without crowding. Crimson Sentry Maple Season-by-Season in Minnesota Spring: Small clusters of yellow flowers pop against emerging deep-purple leaves — a striking early-season contrast. Summer: Holds rich, near-black purple foliage through the heat; the dense narrow column reads like a living exclamation point. Fall: Foliage deepens to purple-bronze before dropping — a moodier finish than the orange-red maples around it. Winter: The tight, upright branch structure keeps its architectural presence even bare, especially flanking an entry. At a Glance ✔ Deer-Resistant ✔ Drought-Tolerant Plant It With Columnar Norway Maple — the green-leaf counterpart; alternate them for a purple-and-green columnar rhythm. Armstrong Gold Red Maple — a slim columnar maple whose golden-orange fall color plays off Crimson Sentry's purple-bronze. Red Rocket Maple — another narrow upright maple, with fiery red fall color for contrast. Crimson Spire Oak — a columnar oak with russet-red fall color and the same tight footprint. Is Crimson Sentry Maple Right for Your Yard? Choose it if you have a full-sun, tight space — a narrow side yard, small front bed, or urban lot — and want bold purple foliage with real vertical presence on tough clay or compacted soil. It's not a fit if you want grass growing right up to the trunk: like all Norway maples, its dense shade and shallow roots will out-compete lawn directly beneath, so plan for mulch or shade-tolerant groundcover at its feet. Show more