Hass avocado

Infobox Cultivar
name = "Persea americana" 'Hass'

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image_width = 200px
hybrid =
cultivar = 'Hass'
origin = Developed in 1926 mainly from the variety "Persea americana guatemalensis", patented in the US, 1935

Hass is a cultivar of avocado, with dark-colored, bumpy skin.Cite web
url=http://whatscookingamerica.net/avacado.htm
title=All About Avocados: History of the Hass Avocado
last=Stradley
first=Linda
work=What'sCookingAmerica.net
publisher=self-published
location=Newberg, OR
year=2004
accessdate=2008-05-13 While this is a self-published work, it cites its sources, and Stradley is a well-known culinary author. The site is a continuation of her book of the same name.] It is correctly pronounced IPA|,Fact|date=July 2008 as in "hassle", not IPA|, like in the common misspelling "Haas". It is named for its originator, a mail carrier and amateur horticulturist Rudolph Hass.Cite web
url=http://www.avocado.org/about/avocado-history/mother-tree
author=
title=The Hass Mother Tree: 1926–2002
work=Avocado.org
pages="About Avocados: History" section
publisher=California Avocado Commission
location=Irvine, CA
year=2008 copyright date
accessdate=2008-09-27] Cite web
url=http://www.indexfresh.com/avocado_history.htm
title=Avocado History
author= =
work=IndexFresh.com
location=Bloomington, CA
publisher=Index Fresh Avocado
date=2007
accessdate=2007-12-29Rs|date=September 2008]

It is the most important avocado in the commercial market worldwide. In the United States, it accounts for more than 80% of the avocado crop,Fact|date=September 2008 including 95% of the California crop, and it is also the most widely grown avocado in New Zealand.Fact|date=September 2008

It produces a medium-sized fruit, weighing 200–300 g. The skin turns a dark, purplish-black when ripe, while the skin of "green" cultivars remains green. When ripe, it yields to gentle pressure; soft Hass avocados are generally considered over-ripe and possibly rancid.Facts|date=September 2008

All Hass avocado trees are related to a single "mother tree" that according to Rudolph Hass's family was grown from seeds purchased from A. R. Rideout of Whittier, California, who was believed to be obtaining seeds from any available source, even garbage. (According to the [California Avocado Commission, Hass bought a whole tree from Rideout, "an innovator and pioneer in avocados".) Rideout showed Hass, who had no horticultural training, how to care for the seedling and in 1926 Hass planted it at his 1.5–acre grove at 430 West Road, La Habra Heights, California. After attempts to graft productive branches from pre-existing Fuerte variety trees (then the predominant cultivar) onto the seedling failed, Hass was convinced to simply let it grow. Although the exact variety of the original seed is uncertain, there is evidenceWeasel-inline|date=September 2008|reason=Then cite it! that a large number of Rideout's seeds were from the subspecies "Persea americana guatemalensis".

Hass patented the resulting tree in 1935 – the first US patent on a tree, and made a contract with Whittier nurseryman Harold Brokaw to grow and distribute the trees produced by the seeds of the "mother tree"; Brokaw was to receive 75% of the proceeds. He specialized in the new variety, and he frequently sold out of the trees. The Hass variety produces fruit year-round, unlike the Fuerte, and has more and larger fruit, with a longer shelf life, and a richer flavor. Although Hass made a profit of less than US$5,000 from the patent (his newfangled patent was not well-respected by other growers, who used single Brokaw-provided trees to graft entire orchards), the US avocado industry today makes over $1 billion annually from the heavy-bearing, high quality fruit of Hass's cultivar, and it accounts for around 80%, worldwide, of all avocados grown today.

The "mother tree" died at 76 years old and was cut down on September 11, 2002, after a decade-long battle against phytophthora ("root rot"); a plaque on West Road marks the spot where it grew. Currently, the Hass Avocados company is headquartered in Santa Paula, California.Fact|date=September 2008 Founder Rudolph Hass died in Fallbrook, California (of a heart attack, at Fallbrook Hospital) in 1952, the same year his patent expired and not long after establishing a new 80 acre orchard.

Hass avocado trees, like some other cultivars, have a tendency to bear well only in alternate years. After a season with a low yield, due to factors such as cold (which the avocado does not tolerate well), the trees tend to produce abundantly the next season. This heavy crop depletes stored carbohydrates, resulting in a reduced yield the following season, and thus the alternate bearing pattern becomes established.Facts|date=September 2008|note=Needs to be sourced at Avocado as well.

References