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Bittersweet is a species of staff vines that blooms mostly in June and is commonly found on rich, well-drained soils of woodlands. It has a sturdy perennial vine that may have twining, woody stems that are 30 feet or longer and an inch or more thick at the base. The stems are yellowish-green to brown and wind around other vegetation, sometimes killing saplings by restricting further growth. It has tiny, scentless flowers at the tips of the branches. It has colorful, orange fruits that are the size of a pea. These fruits are poisonous to humans when ingested internally, but are favorites of birds.