Persea americana

Avocado (Persea americana)
Hass avocado, whole and halved. Photo by Ivar Leidus, CC BY-SA 4.0, via Wikimedia Commons.
Scientific name	Persea americana
Common names	Avocado, avocado pear, alligator pear, aguacate, palta
Genus	Persea
Family	Lauraceae
Order	Laurales
Native range	Mexico and Central America; now widely cultivated in tropical and subtropical regions
Growth form	Evergreen tree, sometimes briefly deciduous around flowering
Mature size	Usually about 9–20 m; Kew reports trees up to 40 m
Climate and site	Tropical to subtropical; race and cultivar determine cold tolerance; protect from frost and strong wind
Soil and water	Deep, well-drained, aerated soil; flooding and prolonged saturation can cause root decline
Propagation	Seed for rootstocks or variable seedlings; cleft or veneer grafting for named varieties
Years to fruit	About 3–4 years for grafted trees; seedling timing is N/A
Pollination	Flowers open in A or B patterns; self- and cross-pollination both occur, but cultivar combinations can improve set
Fruit and harvest	Single-seeded berry; variety-dependent maturity; picked fruit ripens in about 3–8 days

Avocado (Persea americana Mill.) is a variable evergreen fruit tree in the laurel family, Lauraceae. It is native to Mexico and Central America and is now cultivated widely in tropical and subtropical regions. The edible fruit is a single-seeded berry with oily flesh.^[1]

Description

Green foliage on an immature avocado tree in Jakarta, Indonesia. Photo by Vitaium, CC BY-SA 4.0, via Wikimedia Commons.

Avocado trees normally grow to about 20 m, although Kew's species profile records exceptional trees reaching 40 m. The crown is usually rounded, and the leaves are leathery, dull dark green above, paler beneath, and aromatic when crushed. Young foliage may be reddish or pubescent before becoming darker and smoother.[1]^[2]

The flowers are small, yellowish-green, and bisexual, but the female and male functions mature at different times. Fruit shape ranges from spherical to pear-shaped. Each fruit contains one large seed surrounded by firm to buttery flesh; skin color and thickness, fruit size, and oil content vary widely among cultivars and ecological races.[1][2]

Distribution and habitat

Kew places the species' origin in Mexico and Central America, including the Pacific side of Guatemala, El Salvador, Nicaragua, Costa Rica, and Panama. Its natural ecology includes cloud forests and lower rainforest slopes on well-drained soils. Long cultivation has produced three horticultural groups commonly called the West Indian, Guatemalan, and Mexican races, although Kew notes that their boundaries and origins require further study.[1]

West Indian types are associated with warm lowland conditions, Mexican types with cooler highland conditions, and Guatemalan types with intermediate elevations. These are cultivation and breeding groupings rather than a substitute for identifying the individual cultivar or rootstock.[1][2]

Cultivation

Avocado needs warmth, full sun, and a root zone that remains oxygenated after irrigation or rain. Choose the warmest available site that does not flood, and protect young trees from strong wind. Florida extension guidance gives a mature landscape size of roughly 9–20 m and recommends planting well away from buildings and other trees unless the tree will be pruned regularly.[2]

Soil

The native habitat includes cloud forests and lower rainforest slopes with well-drained soils. In cultivation, avocado tolerates many soil types when drainage is reliable, including the sandy and limestone soils described by UF/IFAS for Florida. Continuously wet or flooded soil reduces growth and yield, promotes nutrient problems and dieback, and greatly increases the risk of Phytophthora root infection. On a site that remains wet after rain, plant on a large mound or another raised, freely draining position rather than treating saturation as a normal water requirement.[1][2]

Sun and humidity

Full sun gives the best growth and fruit production. The species comes from humid tropical to subtropical environments, but humid air does not compensate for poorly aerated soil. Maintain airflow around the canopy and shelter the tree from persistent wind because the limbs are brittle and can break under wind or heavy crop loads. Young trees need protection from temperature extremes while they establish.[1][2]

Seasonal changes

Some varieties lose their leaves briefly before or during flowering. Flowering and fruit maturity depend on the race, cultivar, rootstock, latitude, rainfall, and temperature rather than on one universal calendar. In Florida, UF/IFAS lists variety-dependent maturity from June through March. In a cooler subtropical climate, protect the tree during freeze events and expect cold injury or delayed flowering even when a mature tree survives. Keep irrigation regular during establishment and fruit development, but do not maintain a saturated root zone during wet periods.[2]

Propagation

Fresh seed germinates readily, but seedlings do not reliably reproduce a named variety and are better treated as rootstocks or variable trial plants. For named cultivars, UF/IFAS identifies cleft grafting as the preferred Florida method and also describes veneer grafting onto vigorous seedlings. Propagation by cuttings and air-layering has not been successful in the cited extension guidance.[1][2]

Grafted trees begin producing in about three to four years in the UF/IFAS home-landscape account. A dependable species-wide seedling interval is not established here; seedling trees vary in juvenile period, rootstock, climate, and cultivar ancestry, so the summary field remains N/A rather than borrowing a number from grafted trees.[2]

Flowering, fruiting, and harvest

Beginning of flowering on an avocado tree in Réunion. Photo by B.navez, CC BY-SA 3.0, via Wikimedia Commons.

Avocado flowers open twice. In the first opening the female parts function; after the flower closes, the male parts function during the second opening. Cultivars are commonly grouped as type A or type B according to the timing of those phases. Self-pollination can occur, and cross-pollination by wind and large insects can also contribute to fruit set. Some cultivars crop well alone, while others set more reliably when an appropriate contrasting flowering type is nearby.[2]

Less than one percent of flowers may ultimately become mature fruit, and varieties differ in crop load and alternate-bearing tendency. UF/IFAS reports that grafted trees begin cropping after about three to four years and that Florida avocado varieties mature from June through March; those figures are regional and cultivar-specific rather than a universal harvest schedule.[2]

Avocado fruit generally does not ripen on the tree. Pick a representative large fruit at the beginning of the expected cultivar season and test it indoors. Under the UF/IFAS guidance, a mature fruit commonly softens in about three to eight days after picking. Fruit can remain on the tree for a period, but late-hanging fruit are increasingly likely to drop or develop quality problems.[2]

Fruit and uses

Avocado fruit and longitudinal cross-section, photographed in Dar es Salaam, Tanzania. Photo by Muhammad Mahdi Karim, GFDL 1.2, via Wikimedia Commons.

Avocado flesh is eaten fresh in salads, spreads, dips, and guacamole. Cultivars differ substantially in oil content, skin texture, flesh color, fruit size, and flavor. Florida types in the UF/IFAS account contain about 3–15% oil, while fruit from other ecological races and cultivars can differ considerably.[1][2]

The fruit is most useful when harvested at cultivar maturity and allowed to soften indoors. Refrigeration after ripening slows deterioration, but cut fruit is perishable. Avocado leaves, stems, seeds, and fruit can be poisonous to some animals and birds; the Kew profile also notes that people can experience allergic reactions to the fruit.[1]

Cultivars and selections

The most useful high-level distinction is among the West Indian, Guatemalan, and Mexican ecological races and their hybrids. UF/IFAS lists type A and type B flowering behavior separately from race, so a cultivar choice should account for both cold tolerance and pollination timing. Examples in its Florida guidance include the more cold-tolerant Mexican or Mexican-hybrid selections 'Brogdon', 'Gainesville', 'Mexicola', and 'Winter Mexican', while West Indian types such as 'Pollock' and 'Waldin' need warmer, nearly frost-free conditions.[2]

These examples are regional cultivar guidance, not a promise of performance in every climate. Rootstock, disease pressure, winter minimums, and the local flowering season can matter as much as the cultivar name.

Commentary

Growers are invited to share observations about avocado on the talk page, especially cultivar and rootstock, climate, provenance, propagation method, plant age, flowering type, fruiting season, winter injury, and how the tree responds to pruning or raised planting.

Photos

References

• ↑ [1] Plants of the World Online: Persea americana, Kew Species Profile, accessed 2026-08-24. Taxonomy, native range, habitat, morphology, ecological races, cultivation, and documented hazards.

• ↑ [2] Crane, J. H., Avocado Growing in the Florida Home Landscape, UF/IFAS Extension publication MG213, accessed 2026-08-24. Pollination, race and cultivar differences, propagation, drainage, frost response, years to fruit, harvest, and home-landscape cultivation.

Image credits

• Avocado Hass - single and halved.jpg — Ivar Leidus; CC BY-SA 4.0. The file identifies the subject as the Hass cultivar grown in Colombia and shows a whole and halved fruit.
• Green avocado foliage (Persea americana).jpg — Vitaium; CC BY-SA 4.0. The file description identifies foliage on an immature avocado tree in Jakarta, Indonesia.
• Persea americana flowers.JPG — B.navez; CC BY-SA 3.0. The file shows the beginning of flowering on Réunion Island.
• Avocado with cross section edit.jpg — Muhammad Mahdi Karim; GFDL 1.2. The file shows a whole avocado and its longitudinal cross-section, photographed in Dar es Salaam, Tanzania.
• Persea americana fruits 02.JPG — B.navez; CC BY-SA 3.0. The file description identifies young and ripe avocado fruits with red young foliage on Réunion Island.