Solanum viarum, the tropical soda apple, is a species of perennial shrub native to Brazil and Argentina with a prickly stem and prickly leaves. The fruit is golf-ball-sized with the coloration of a watermelon. It is considered an invasive species in the lower eastern coastal states of the United States and more recently in New South Wales and Queensland in Australia (first being spotted on the Mid North Coast in 2010).

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