Solanum viarum, commonly known as Tropical Soda Apple, is a perennial shrub native to the grasslands and open woodlands of South America. It is characterized by its prickly stems and broad leaves, which can grow up to 6 feet (1.8 meters) in height and width. The plant produces white to pale violet flowers and distinctive golf-ball-sized fruits that resemble a watermelon in coloration, with green and white mottling. These fruits contain numerous seeds and are not edible due to their toxicity. The flowering season extends from spring to fall, and while the flowers are not particularly showy, the fruit is quite noticeable.

Tropical Soda Apple is known for its rapid growth and ability to colonize disturbed areas, making it a concern for natural habitats. It is not typically cultivated for ornamental purposes due to its invasive nature and potential to outcompete native species. In cultivation, it requires full sun to part shade, moderate water, and well-draining soil. However, due to its invasive potential, it is not recommended for planting outside its native range. In areas where it is not invasive, it may be used for educational purposes to demonstrate plant invasiveness and control methods.CC BY-SA 4.0