Japanese maple seeds are ready for harvest in September and October, per the North Carolina Cooperative Extension Service. The seeds come in a type of fruit called a samara, which consists of two winged seeds joined together.
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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.