Variety profile

Oro Blanco Grapefruit

(Citrus grandis × Citrus paradisi 'Oro Blanco')

Documented by Léo — grown in the ground, USDA zone 8b

Oro Blanco grapefruit (Citrus grandis × Citrus paradisi 'Oroblanco') is a modern hybrid between the Siamese Sweet pummelo and the white Marsh grapefruit, created in California in 1958 to combine the sweetness of the Asian pummelo with the generosity of the grapefruit. Its tree hardiness reaches 14°F (−10°C), making it suitable for in-ground growing in USDA zone 8a-8b. The vigorous tree reaches 10 to 16 ft (3 to 5 m) with a rounded habit, evergreen foliage, and fragrant white flowers. Its golden-yellow fruit, large at 10.6 to 14.1 oz (300 to 400 g) with thick skin, ripen in winter and have white to light green flesh, juicy, sweet, and slightly tart, with little bitterness unlike classic grapefruits. Excellent fresh for those who dislike the bitterness of grapefruit, and in winter fruit salad. Graft onto Poncirus trifoliata.

Labeled trays of cut grapefruit and pummelo samples
Photograph: Grapefruit and Pummelo (8449598338).jpg by Leslie Seaton from Seattle, WA, USA, CC BY 2.0, via Wikimedia Commons
Cold hardiness 14°F (−10°C)

Identity

OriginUnited States (California)
Genetic originHybrid pummelo × grapefruit (Citrus maxima × Citrus paradisi)
USDA zone
Cold hardiness14°F (−10°C)
Fruit cold hardiness28°F (−2°C)
GrowthVigorous
Height16 ft (5 m)
HarvestJanuary, February, March, April, November, December
SeedsSeedless
FlavorsSweet, Slightly acidic, Highly aromatic

History & Description

Origin

Oro Blanco, whose Spanish name means white gold, is a hybrid created in 1958 by researchers at the University of California, Riverside, from a cross between an Asian pummelo (Citrus maxima) and a grapefruit (Citrus paradisi). This breeding program aimed to obtain a fruit without bitterness, sweet and pleasant to eat out of hand. After two decades of work, the variety was officially released in the 1980s and quickly won over the European and American markets. Its name evokes the golden color and the sweetness of its ivory flesh. Little known to the general public, Oro Blanco remains a sought-after connoisseur's variety. It is now grown in many Mediterranean countries, in California, in Israel, and in the mild-winter regions of Europe.

Tree description

Oro Blanco is a medium to large tree, able to reach 13 to 16 ft (4 to 5 m), with an upright, slightly open habit. Its glossy green evergreen foliage is made up of large leaves characteristic of grapefruits. The white, very fragrant bloom comes in spring. Growth is vigorous and the tree establishes quickly in the ground in sheltered areas.

Fruit quality

The Oro Blanco fruit is bulky, weighing between 14.1 and 17.6 oz (400 and 500 g), with smooth, thick, pale yellow skin. The flesh is creamy white, melting, without bitterness, with a mild, lightly sweet flavor that contrasts pleasantly with the classic grapefruit. It is practically seedless, which makes it very convenient to eat. The harvest runs from November to April, offering a long winter production window.

Flavor and ornamental interest

Oro Blanco is eaten mainly as a table fruit, its sweetness free of bitterness winning over even palates not used to citrus. It gives a delicate, fragrant juice of beautiful clarity. Its zest, with little bitterness, is valuable in pastry and sweet cooking. Ornamentally, its large golden fruit that stay on the tree for several months create a spectacular effect in zone 8a gardens, where it is an original alternative to classic grapefruits.
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"Growing rare citrus means accepting that nature has the last word, while whispering in its ear how to survive the winter."

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