Acer ginnala Amur Maple is a hardy, compact, multi-stemmed or single-trunked ornamental tree known for its brilliant red-orange fall color, fragrant spring flowers, and adaptability. It is cold-hardy (Zone 2-7), drought-tolerant, and well-suited for prairie climates, making it a great choice for Southwest Saskatchewan. It can be grown as a small tree or large shrub, and it’s often used for hedges, windbreaks, or specimen plantings. Planting & Location Hardiness Zone: 2-7 (extremely cold-hardy) Mature Size: Tree Form: 15-20 feet tall, 15-20 feet wide Shrub Form: 10-15 feet tall, 10-15 feet wide Growth Rate: Moderate (12-24 inches per year) Sunlight Needs: Full sun to partial shade (best fall color in full sun) Soil Preference: Adaptable to loamy, sandy, and clay soils. Tolerates slightly acidic to alkaline soils (pH 5.5-8.0). Prefers well-drained soil but tolerates periodic drought. Spacing: 15-20 feet apart for individual trees. 3-5 feet apart for a hedge or windbreak. Watering Young Trees (First 2-3 Years): Water deeply once per week to establish roots. Established Trees: Drought-tolerant; water every 2-3 weeks in dry periods. Avoid Overwatering: Prefers moderate soil moisture but does not tolerate standing water. Fertilizing First Year: No fertilizer needed—focus on root development. Mature Trees: Apply a balanced slow-release fertilizer (e.g., 10-10-10) in early spring if growth is slow. Organic alternative: Compost or well-rotted manure in spring. Pruning & Maintenance Best Time to Prune: Late winter to early spring, before new growth starts. How to Prune: Remove dead, diseased, or crossing branches. Maintain a strong central leader if grown as a tree. For hedge pruning, shear lightly in early summer to maintain shape. Suckering: May produce root suckers—remove them to maintain tree form. Pest & Disease Management Common Pests: Aphids – Can cause curled leaves and sticky honeydew. Solution: Spray with insecticidal soap or introduce ladybugs. Scale Insects – May appear on branches, causing leaf yellowing. Solution: Treat with horticultural oil in early spring. Common Diseases: Verticillium Wilt – A soil-borne fungus that causes branch dieback. Solution: Improve soil drainage and avoid overwatering. Tar Spot (Rhytisma acerinum) – Causes black spots on leaves in late summer. Solution: Rake and remove infected leaves in fall to prevent spread. Powdery Mildew – White fungal coating on leaves in humid conditions. Solution: Improve airflow and apply fungicide if needed. Winter Protection Highly winter-hardy, but young trees may benefit from mulching around the base. Sunscald Prevention: Wrap trunks of young trees in late fall to prevent winter sun damage. Rodents & Deer: Use tree guards if browsing is an issue. Landscape Uses Great as a small ornamental tree or large shrubExcellent hedge or privacy screen (fast-growing and dense)Brilliant fall color (red-orange leaves)Low-maintenance and drought-tolerantCold-hardy and adaptable to various soil types Additional Notes: Lifespan: 40-60+ years with proper care. Works well as a specimen tree, windbreak, or hedge. Amur Maple can self-seed in some areas—regular pruning helps manage spread. Photo courtesy of Millcreek Nursery
