Casimiroa edulis

Accession Count: 1
Common Name: white sapote
Family Name: Rutaceae
Botanical Name: Casimiroa edulis
Sub Species:
Variety:
Forma:
Cultivar:
Characteristics:
White sapote has a lifespan of 40-150 years, and grows rapidly, in spurts. It is evergreen, but it may drop its leaves if stressed by cold or drought. The flowers are clustered and tiny, with five greenish-yellow petals, and without fragrance. While most flowers contain both male and female parts, some may be male only, and others may be incapable of producing pollen. It blooms early- to mid-winter in regions without freezes and may bloom several times a year. Some cultivars bloom in alternate years. It is self-fruitful, but cross pollination with another plant can improve fruit set. 
This tree begins to fruit after 3-4 years when grafted, and after 7-8 years if grown from seed. The edible fruit has thin green skin with white flesh, is variable in shape and size, resembling an apple, and contains 1-5 poisonous seeds. When fully ripe and soft, it has a custard like texture with a banana, peach, or vanilla taste. The skin is bitter on some cultivars. It takes 6-9 months for the fruit to ripen.
The leaves are alternate, palmately compound with three to five leaflets, and have smooth  margins. New leaves are reddish and age to glossy medium green. The thornless branches are somewhat brittle and young trees should be protected from wind. Older branches become stronger but should not be climbed. The trunk and branches are prone to sunscald if not shaded by leaves. 
This tree is usually grafted onto rootstock, such as Casimiroa edulis 'Pike', which grows vigorously. 'Pike' produces a long tap root and invasive side roots that spread beyond the drip line. 

Compound: Cas edu
Geographic Origin: Central Mexico
Ecozone Origin: Neotropic
Biome Origin:
Natural History:
The flowers attract bees. The fruit attracts birds and mammals.

Cultivation Notes:
In desert regions with high summer heat, locate this tree where it has a southern, not western, exposure for winter warmth, but in all day part shade, especially afternoon part shade, and is protected from strong winds. It becomes stressed in high temperatures during its first three years. It should also be kept away from low areas where cold winter air may collect. The soil in that location must drain exceptionally well. This tree needs very well drained soil and is not tolerant of waterlogged or flooded ground. It does best with pH 5.6-7.8 (slightly acidic to slightly alkaline) soil, and can tolerate alkaline soil if given plant micronutrients to overcome nutritional deficiencies. It is tolerant of most soil types otherwise, but is not salt tolerant. This tree can be grown in a container 18-30" in diameter and 18" deep, however a larger pot will be needed as the tree grows. 
Apply an organic fertilizer every two months. Avoid chemical fertilizers to avoid salt buildup. Use plant micronutrients in irrigation water once a year mid winter. 
After the tree is established, deep water every week or two during the growing season. Spread organic mulch inside the drip line and 8" away from the trunk to retain soil moisture and reduce weeds. 
In the first year, trim off all flowers and flower buds to establish better root growth. Deep water every 2-3 days at the start, then gradually lengthen the interval from every 4 to 7 days. Protect from temperatures below 30°F. Extra shade may be needed in the first three years to protect the tree in high temperatures.
During pruning, remove horizontal branches to avoid weak branching. Prune at top to maintain a height of 10-12' to reduce wind damage and make the tree easier to maintain. Some low branches should remain to shade the trunk and prevent sunscald. Remove any grass and other plants growing within the drip line to reduce nutrient and water competition. 
The fruit should be harvested when they become very slightly soft on the tree and before they drop. Remove fruit by cutting the stems with clippers. Removing them without clipping, or having dropped when soft, results in internal bruising leading to decay and bad tasting pulp. Ripen the fruit at room temperature. Ripe fruit can be stored up to two weeks in a refrigerator. The fruit may drop off the tree early while still hard. In that case, take them inside to ripen up. They will continue to ripen after harvest, and the stem will fall off when a fruit is fully ripe. The fruit must be handled with care and are easily bruised internally, becoming bitter under the bruise.
Propagation is best done by using mature budwood with gray bark grafted onto vigorous seedlings. Seed must be cleaned, air dried, and planted within 3 weeks of removal from its fruit. Dried seed more than one month old is not viable. Seed  does not grow true to the parent.

Ethnobotany:
White sapote is grown for its edible fruit, and as an ornamental. The fruit pulp has no sedative compounds; however, the leaves and bark do contain sedative compounds and a tea made of its leaves causes drowsiness. The poisonous seeds, when ground up, are used to kill cockroaches. 
The name sapote comes from a Nahuatl word that means any soft, edible fruit. White sapote is not related to black sapote (Diospyros nigra) of the Persimmon family, nor to mamey sapote (Pouteria sapota) of the Sapodilla family.


Height: 20 - 50 feet
Width: 20 - 50 feet
Growth Rate: Moderate Growing
Grow Season:
Flower Season: Winter
Color: White
Function: Habitat
Spread: Non-spreading
Allergen: Non-allergenic
Invasive: Benign
Toxicity: Toxic
Hardy: Tender
Water Use: Moderate Water Use
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Casimiroa edulis