Apple

Where apples come from

Every domesticated apple traces its lineage to Malus sieversii, a wild apple species still growing in the Tian Shan mountains of Kazakhstan. Bears, deer, and especially horses ate the fruit and dispersed seeds along the Silk Road. Migrating traders carried apples west into Europe more than two thousand years ago, where they hybridized with crab apples and were grafted into the cultivars we know today.

Why no two seeds are alike

Apple trees grown from seed are extreme heterozygotes — every seed produces a wildly different tree, often with smaller, sourer fruit than the parent. Every named variety (Honeycrisp, Gala, Granny Smith) is propagated by grafting cuttings onto rootstock, so each tree of a given variety is genetically a clone.

A pome, not a berry

Apples are pomes: fleshy fruits where the bulk of the flesh comes from the receptacle (the swollen end of the flower stem) rather than the ovary. The “core” with its papery chambers is the actual ovary.

Storage and ripening

Apples release ethylene gas as they ripen, which accelerates ripening in nearby fruit. Commercial cold storage uses controlled atmospheres (low oxygen, high CO₂) to slow this and keep apples crisp for up to a year.