The Hass avocado tree (Persea americana 'Hass') is the world's most popular commercial avocado variety, known for its high yield of creamy, pebbly-skinned, purple-black fruit. It is a vigorous, upright evergreen tree, typically growing 15-25 feet tall (or 5–7 ft in containers), suitable for USDA Zones 9-11 and full sun.