Avocado

Avocado can be raised from seed, sown directly in soil or started in water until the seed splits and roots appear within two to six weeks, then transplanted into potting soil; seed-grown plants make attractive houseplants but do not bear fruit, so commercial trees are grown from grafted or planted rootstock instead. The tree wants full sun to partial shade, an organically rich, evenly moist, well-drained soil, and regular watering while young and during droughts, with mulch and periodic fertilization supporting the shallow root system afterward.

The canopy needs pruning for strong structure, since avocado wood is brittle and prone to storm breakage once trees exceed about 50 feet in the open; the species also has no tolerance for frost, and flowering and fruit set are reduced by cold snaps below about 10°C or heat spikes above roughly 35°C during bloom.

Laurel wilt, spread by the redbay ambrosia beetle, is a major and often fatal threat to avocado trees, typically killing an infected tree within four to eight weeks. Root rot caused by soil-borne pathogens develops in poorly drained or overly wet soil, and the species is also noted as susceptible to Verticillium wilt.

Mites and scale insects can build up into serious local infestations, and leaf-spotting diseases are occasionally troublesome; commercial growers have managed much of this pest pressure through beneficial-insect releases and root-rot-tolerant rootstocks rather than routine spraying.

Commercial fruit is picked while still unripe and left to ripen afterward off the tree, since avocados do not soften on the branch. Fruiting occurs from roughly late summer into early spring, following flowers borne in winter to early spring, and out of the abundant bloom only a small fraction of flowers ever set fruit that reaches harvest.

Culinary: The fruit is eaten raw in salads and sandwiches, blended into guacamole, and pressed into an oil used as a salad dressing; its flesh is valued for a high fat content.

Industrial: Oil pressed from the seed and pulp has been used in soaps, skin moisturizers, and hair-care products, while the leaves yield a yellowish-green essential oil. The brittle wood has nonetheless been made into veneer and plywood for furniture, tools, and construction, the seed has been ground into a reddish-brown to blackish ink once used for documents and marking textiles, and bark boiled with dyes has been used in Guatemala to set color.

Cultural: The Nahuatl people regarded the avocado as a symbol of fertility, and the plant has a long history of medicinal, culinary, and cultural use across Mesoamerica and Latin America.

Avocado originates from Mexico and Central America, with a natural range stretching from the central highlands of Mexico to the rain forests of northwest Colombia. Archaeological evidence places avocado use in this region back roughly 10,000 years, with cultivation understood to have begun around 8,000 BCE, making it one of the long-domesticated fruit trees of the Americas; before European contact it was grown from the Rio Grande south to central Peru.

Three ecological races were shaped by this early cultivation across differing climates: a cold-tolerant Mexican race, a semitropical Guatemalan race, and a fully tropical West Indian race, each with different frost tolerance. Following the European arrival in the Americas, the crop was carried onward to Jamaica by 1696, the Philippines by the end of the 16th century, the Dutch East Indies by 1750, Mauritius by 1780, Singapore by 1830, Hawaii by 1825, Florida by 1833, India by 1892, and California by 1871, with vegetative propagation beginning around 1890 and commercial plantings established by 1930.