Frost Washington navel orange
Citrus sinensis (L.) Osbeck
Photos by David Karp and Toni Siebert, 1/28/2010, CVC. Photo rights.
Source: Received as seed from an unknown source.
Parentage/origins: A nucellar seedling selection from Washington navel orange.
Rootstocks of accession: Carrizo citrange
Season of ripeness at Riverside: December to January
Description from The Citrus Industry Vol. 1 (1967):
"Frost Washington is the first, and currently much the most important, nucellar budline of the Washington navel. It was originated by H. B. Frost, the geneticist and breeder, at the University of California Citrus Research Center, Riverside, from a controlled cross made in 1916. It was not released until 1952, however. Since that time its popularity has increased until it is now more widely planted in California, Arizona, and Morocco than any other clonal selection of Washington.
Availability: Commercially available in California through the Citrus Clonal Protection Program.
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