Almond

Almond trees are established as grafted, long-lived perennials and cropped over many seasons before an orchard is removed and replanted. Because the tree is grown for its seed rather than its fruit flesh, harvest, pollination biology, and processing all differ notably from related stone-fruit crops such as peach.

Global production is concentrated where a reliably dry harvest period coincides with the winter chill needed for normal flowering, and orchard-level decisions such as cultivar selection, pollinizer design, and rootstock are made once at establishment and shape management for the life of the planting.

Family

Rosaceae (rose family)

Genus

Prunus

Principal species

Prunus dulcis (cultivated almond)

Fruit structure

A drupe (stone fruit) in which the edible portion is the seed, or kernel, enclosed in a hard endocarp (shell) beneath a leathery hull; unlike peach or plum, the fleshy mesocarp is not eaten

Growth habit

Deciduous tree, commercially propagated by grafting a fruiting cultivar onto a selected rootstock

Almond is native to a region spanning parts of Central and Southwest Asia and the Eastern Mediterranean, where it was domesticated in antiquity. Cultivation spread throughout the Mediterranean basin over subsequent centuries, and it was later introduced to other Mediterranean-type climate regions worldwide.

Almond requires a genotype-specific period of winter chilling to break dormancy and flower normally in spring. Because almond tends to bloom early relative to many other temperate tree crops, spring frost during or shortly after bloom is one of the most significant climate risks, as flowers and young fruit are frost-sensitive.

A dry period around harvest is also important, since the hull-split and drying process that precedes hulling and shelling benefits from low humidity and limited rainfall.

Almond performs best on deep, well-drained soils with good aeration; loams and sandy loams are generally favored. The crop has limited tolerance for waterlogging and poor drainage, which restrict rooting and increase the risk of root diseases.

Establishing an almond orchard begins with selecting a rootstock and cultivar combination suited to the site and market. Because most cultivars are self-incompatible, orchard design places significant weight on choosing pollinizer cultivars with bloom periods that overlap the main cultivar and on ensuring adequate insect pollination during the bloom window.

• Rootstock selection for vigor, anchorage, and site adaptation
• Cultivar and pollinizer selection for cross-pollination and overlapping bloom
• Training and pruning system matched to planting density and mechanization
• Long-term orchard floor and canopy management across many productive years

Nitrogen supports vegetative growth and kernel development, while potassium influences kernel fill and overall tree condition. Boron and zinc are micronutrients of particular relevance to almond, since deficiencies in either can affect flowering, fruit set, and shoot growth.

Almond is grown almost exclusively under irrigation in most commercial production regions, with water demand rising through kernel fill and continuing until hull split. Drip irrigation and micro-sprinkler irrigation are both widely used, applying water efficiently to the root zone while helping manage orchard floor conditions ahead of harvest.

Irrigation scheduling aims to avoid stress during sensitive growth stages while also supporting the dry orchard-floor conditions that mechanical harvest and drying require later in the season.

Anthracnose can affect blossoms, shoots, and developing fruit in humid or wet conditions, particularly around bloom. Root rot, often associated with poorly drained or waterlogged soils, can weaken or kill trees over time and is closely linked to site drainage and rootstock choice. Insect pests include aphids, which can distort new growth, along with weevils and mealybugs, which affect shoots, nuts, or general tree vigor depending on species and region.

Management combines resistant or tolerant rootstocks and cultivars where available, orchard sanitation, monitoring, and — where justified — locally authorized control products applied according to their labels.

Almond harvest begins once the hull has split open, exposing the shell within. Nuts are typically removed from the tree by mechanical shaking onto the orchard floor, where they are left to dry before being swept, picked up, and transported for hulling and shelling to recover the kernel.

• Raw and roasted kernels for direct consumption
• Processed products such as almond flour, almond milk, and confectionery ingredients
• Almond oil pressed from the kernel
• By-products such as hulls and shells, used variously as livestock feed, bedding, or a soil amendment depending on region