Adirondack Crabapple

Malus 'Adirondack' (Rosaceae) is a deciduous ornamental crabapple cultivar noted for its narrow, upright habit and heavy spring bloom. White flowers open from red buds, and small persistent fruit provides winter interest and wildlife food.

This cultivar performs in full sun on well-drained soil. Bloom begins around 260 GDD (base 50 F) with full bloom near 379 GDD. Disease resistance is a key selection trait in modern crabapple breeding. Like all Malus, it benefits from good air circulation to reduce foliar disease pressure.

Among the strongest crabapple performers for the Puget Sound region. The narrow vase-shaped habit (10-12 ft spread on an 18-20 ft tree) fits between house and sidewalk without pruning, making 'Adirondack' a viable specimen for small residential yards and a useful street tree where overhead lines or property lines constrain canopy spread. Excellent resistance across all four major crabapple diseases is independently corroborated by the J. Frank Schmidt evaluation chart and the Morton Arboretum crabapple performance ratings. Apple scab pressure in maritime PNW is high in most years due to cool wet springs, so disease resistance is a non-negotiable trait for new crabapple installations here. As one of the latest-blooming cultivars in the recommended set, 'Adirondack' is useful for extending the regional pollination window for home-orchard fruiting apples — it overlaps with mid- and late-blooming apple cultivars (Gala, Honeycrisp, Fuji) that need cross-pollination. Fruit persistence into early winter provides forage for overwintering thrushes, cedar waxwings, and robins; the small 0.5-inch fruit size minimizes the sidewalk-mess problem associated with larger-fruited crabapples like 'Indian Magic'. Selected as a Great Plant Picks recommendation, which is the regional plant-evaluation program covering British Columbia, Washington, and Oregon — the GPP endorsement is the closest equivalent to a regional trial result for ornamentals.

— Chris Welch, ISA Certified Arborist