There is more than one plant that goes by the name skeleton weed. Rush skeleton weed (Chondrilla juncea) is a perennial plant that starts to produce yellow flowers at the beginning of spring and continues until frost hits in the fall, according to Kootenai County in Idaho. Skeleton-weed (Lygodsemia juncea and other members of the Lygodsemia genus) flowers in July and August.
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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.