Fortunella crassifolia Swingle
Photos by David Karp and Toni Siebert, CVC. Photo rights.
Source: Received as a live tree from W.T. Swingle, USDA, 1924.
Parentage/origins: Parents unknown.
Rootstocks of accession: Carrizo citrange, Cleopatra mandarin
Season of ripeness at Riverside: Year-round
Season of flowering at Riverside: May to September
Notes and observations:
Meiwa kumquat, Fortunella crassifolia, is a lesser-known species of kumquat.The tree is similar to the Nagami kumquat in appearance, but it cannot be budded onto all the same rootstocks as Nagami. Trifoliate seems to be the best rootstock choice for Meiwa. Kumquat trees are especially susceptible to zinc deficiency, which can cause small leaves and reduced internode distance. As with Nagami, Meiwa trees are semi-dormant in winter, allowing them to withstand temperatures below freezing. The flowering season is in summer, and the fruits mature in late winter. The almost-round fruits are orange at maturity, up to one and one-half inches in diameter. The sweet rind is thicker than the rind of Nagami, making it seem sweeter than Nagami. The flesh is light orange, contains a few seeds, and is acidic.
Description from The Citrus Industry Vol. 1 (1967):
"This species is the Ninpo, Meiwa or Neiha kinkan of Japan. The most distinctive features of this kumquat are the short oblong to round form and relatively large size of the fruit, the more numerous sections (commonly seven), the very thick and sweet rind and comparatively sweet flavor, and the low seed content (many fruits are seedless).
Availability: Not commercially available in California.
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