Apple
Malus domestica
Rosaceae · deciduous tree · introduced
Last updated
Apples in the Puget Sound lowlands require more disease management than most home gardeners expect. Scab thrives in our wet springs and is the primary fungal threat; codling moth is the insect that ruins the harvest. Without some form of spray program, expect damaged fruit most years. Cultivar choice helps: modern disease-resistant varieties (Liberty, Enterprise, Pristine) reduce but do not eliminate the need for management. Dwarf rootstocks (M.9, M.26, G.41) keep trees manageable for spraying, pruning, and netting. Most varieties need a pollinizer; check bloom timing compatibility. Most lowland soils are adequate if drainage is acceptable; on alluvial clay or over shallow hardpan, raised beds improve results. Summer drought stress opens the door to secondary pests. If you are not willing to spray at all, consider cider varieties that tolerate cosmetic damage.
— Chris Welch, ISA Certified Arborist
Malus domestica (Rosaceae) is a deciduous fruit tree originating in Central Asia (primarily Kazakhstan and adjacent regions). It grows 15 to 30 feet tall and wide depending on rootstock, forming a rounded to spreading crown. Pink-white flowers (1 to 1.5 inches across) appear in cymes of 4 to 6, with the central "king bloom" opening first. Thousands of cultivars exist, spanning a vast range of fruit size, color, flavor, and ripening season.
Apple requires full sun to part shade on moist, well-drained soil (pH 6.0 to 8.0). Most cultivars are not self-fertile and require a compatible pollination partner blooming at the same time. Maintenance is high: the species is subject to extensive disease pressure (scab, fire blight, powdery mildew, cedar-apple rust among others) and insect damage (codling moth, apple maggot, aphids). Dwarfing rootstocks control tree size and often improve precocity. Hardy in Zones 4a to 9b.