Solanum rantonnetii, also known as Lycianthes rantonnetii, is a species of flowering plant in the Solanaceae family. It is commonly referred to as the blue potato bush or Paraguay nightshade. Here are some key characteristics of Solanum rantonnetii:

1. Flowers: The plant produces clusters of small, star-shaped flowers that are typically a vibrant blue-purple color. The flowers are attractive to bees and butterflies.

2. Foliage: The leaves are dark green and ovate (egg-shaped), providing a lush backdrop to the colorful flowers.

3. Growth Habit: Solanum rantonnetii is a shrubby plant that can grow up to 2-3 meters (6-10 feet) tall and wide. It tends to have a dense and bushy growth habit.

4. Hardiness: It is generally considered frost-tender and is best suited to warmer climates. It can tolerate light frost for short periods but may suffer damage in prolonged cold spells.

5. Cultivation: This plant prefers full sun to partial shade and well-draining soil. It requires regular watering, especially during dry periods, to maintain healthy growth and flowering.

6. Uses: Solanum rantonnetii is often grown as an ornamental shrub in gardens and landscapes, where its colorful flowers add a splash of brightness. It can be used as a hedge, specimen plant, or in containers.

Overall, Solanum rantonnetii is valued for its attractive flowers and relatively easy care, making it popular among gardeners looking to enhance their outdoor spaces with vibrant blooms.