There is more than one fruit that has Japanese plum as a common name. Prunus salicina is ready in late summer and fall, depending on the variety. The loquat (Eriobotrya japonica) is tropical and can be picked in February and March.
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Marie Notnats enjoys learning about new topics and teaching people new skills. She has been writing professionally since 2008. She is a professional horticulturist with a Bachelor of Science degree in horticulture from Brigham Young University. She writes for About.com, Examiner.com, eHow, and assorted gardening blogs.