Zumi Calocarpa Crabapple

Zumi Calocarpa is one of the older traditional crabapples that has earned its century-plus reputation through reliable performance, and it remains an excellent recommendation for Puget Sound landscapes. The disease resistance profile (Scab Excellent, Fire Blight Excellent, Rust Excellent, Mildew Good per JFS) is among the best of any crabapple in commerce — meeting or exceeding most modern named cultivars on the major pathogens. For PNW landscapes where high spring scab pressure is the norm, this is a meaningful selling point. The 20-25 ft × 24 ft mature size makes Zumi Calocarpa larger than compact cultivars like ‘Adirondack’ (10 ft spread) or ‘Coralcole’ (15 ft) — better suited to acreage, parkland, or larger residential yards where the gracefully spreading rounded form can be displayed. The bright red bud-to-white flower contrast at peak bloom and persistent glossy red fruit through winter give the cultivar genuine multi-season ornamental interest. Often used as a pollinizer for fruiting apple orchards because mid-season bloom overlap with commercial varieties is good. Sourcing note: at PNW nurseries, this cultivar is sometimes sold simply as "Redbud Crabapple" — verify the full botanical name (Malus × zumi ‘Calocarpa’) because straight Malus zumi has meaningfully different characteristics.

— Chris Welch, ISA Certified Arborist