Ipomoea costata, commonly known as rock morning glory, is an Australian native plant. It is found in northern Australia, from Western Australia, through the Northern Territory, to Queensland. Lycianthes rantonnetii (blue potatobush) is a species of flowering plant in the family Solanaceae. It is native to Brazil, Bolivia, Argentina and Paraguay.Cultivated as ornamental the world over. The blue potatobush is an ornamental shrub that features free-blooming blue flowers followed by red berries. It is evergreen in warm climates... Blue potatobush is native to warmer climes and thrives in a temperature range of 68 to 100 °F (20 to 38 ℃). Mild winters and hot summers best replicate its natural habitat. Potatobush plant is grown outdoors in warm climates. In areas with cool winters, grow it as a potted plant that can be brought indoors when frost threatens. The Blue PotatoBush is the name of this bush, the botanical name is Lycianthes rantonnetii, family Solanaceae. This plant was once believed to belong to the Nightshade family. The blue potatobush is a fast growing evergreen that will grow to as much as ten feet in height and width. Typically they are pruned back to a much smaller size. Is blue potatobush perennial? This sun-loving perennial produces unusual purple, 1-inch flowers instead of potatoes! The flowers have gold centers and form on... Plant images and details for Lycianthes rantonnetii - Blue PotatoBush.Plant Information. Buy Now. Add to Cart. Potatobushes in a row grow in a. Size. Format. Q.Potatoes - My potato plant leaves are turning brownish colour and there are lot of dark spots on them.Rose PotatoBush is hardy in warm zones of 10 or higher. The plant likely died. The blue potatobush can grow up to 8 feet tall and 6 feet in diameter. It is hardy in USDA zones 9 through 11 and can survive temperature dips as low as 23 degrees F. The fragrant flowers of Blue PotatoBush (Lycianthes rantonnetii, also known as Solanum rantonnetii, and Paraguay nightshade), provide a focal point to a tropical or cottage garden. Solanum Rantonnetii Information.Growing Solanum Rantonnetii in Pots. You can grow blue potatobush easily in an 8-12 inches pot and keep it on a balcony, patio, or any small space.