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Grapefruit
Scientific Name: Citrus paradisi Macfad.
Synonym:
Family: Rutaceae
Grapefruit (Citrus  paradisi) Recommended Temperature Zone:
sunset: 8-9, 12-24

Sun Exposure: Full sun

Growth Habits: Evergreen tree

Watering Needs: Don't let the soil dry completely, good drainage

Propagation:


Medium to large-size tree, excellent for shade and for growing orchids and hanging plants, providing up to 300 pounds of excellent breakfast or juice fruit per year. Varieties include Duncan (white, seedy pulp, excellent flavor), Marsh (white, seedless) and Ruby (pink pulp, seedless).
Kind Variety Zones (Sunset) Maturity Zone 13 Remarks
Grapefruit, White Duncan 8,9,12-24 December-May One of the oldest grapefruit varieties and, according to many, the best-tasting grapefruit. However, it is very seedy (30-70) and lost popularity as a fresh fruit when the Marsh was introduced.
Grapefruit, White Marsh 8,9,12-24 Mid-Nov to May The most common and widely planted whitegrapefruit in the Salt River Valley. Although the fruit is ready to harvest in December, if left on the tree the fruit will continue to mature and become sweeter with time. Fruit is typically best from March through May after acid levels in the fruit have declined. The fruit is large in size with only a few seeds (0-6).
Grapefruit, Pink Flame 8,9,12-24 Mid-Nov to May A new release from Florida which produces largefruit with few seeds (0-6). The fruit is mature beginning in December. ‘Flame’ is still being evaluated for the low desert.
Grapefruit, Pink Red Blush 8,9,12-24 Mid-Nov to May Popular here in the Salt River Valley, was one of the first pigmented grapefruit varieties. It has large fruit with few seeds (0-6). The internal color is a light pink. The fruit is picked beginning in December, but becomes better the longer it remains on the tree. Interior fruit color becomes golden in spring
Grapefruit, Pink Texas Star Ruby 8,9,12,14-24 Jan-April The darkest flesh color of any variety. However, it is not recommended for the Phoenix area. The trees are sensitive to our hot summers and leaves will sunburn more readily than other citrus trees. High temperatures above 115 degrees may kill ‘Star Ruby’ trees
Grapefuit x Pummelo Melogold 8,9,12-24 Dec-January Retained more of the pummelo characteristics. The fruit is large and has a distinctive taste with a high sugar content. It is less acidic than grapefruit. The peel is thick
Grapefuit x Pummelo Oro Blanco 8,9,12-24 Nov-January ‘Oro Blanco’ has retained more of the grapefruit characteristics. The fruit is about the size of a grapefruit with a slightly thicker peel. The fruit is lower in acid and higher in sugar than grapefruit and has more of the pummelo flavor.
Source: University of Arizona: Cooperative Extension

Blooming Habits:

Fruiting Habits:

Links:
Low desert citrus varieties


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