Blue Potato Tree
NameBlue Potato Tree
Scientific NameSolanum rantonnetii
Common NamesBlue Potato Bush, Paraguay Nightshade, Gentian Sage
Plant FamilySolanaceae
Natural HabitatNative to South America (Paraguay, Argentina, Brazil), thriving in warm, temperate to subtropical climates, often found in open woodlands or disturbed areas. It is widely cultivated as an ornamental.
Parts Usedleaf,fruit
Medicinal Actionsanti-inflammatory,antimicrobial
Traditional UsesWhile Solanum rantonnetii is primarily ornamental and considered toxic, some related Solanum species have been historically used in traditional medicine. These uses often involved external applications of leaves as poultices for skin inflammations or wounds, or very carefully prepared internal remedies for specific conditions, always with awareness of their potent and often toxic nature. Direct medicinal use of Solanum rantonnetii is not recommended due to its toxicity.
Active ConstituentsSteroidal glycoalkaloids, Solanine-like compounds
Preparation Methodspoultice,decoction
Contraindications & WarningsAll parts of the Blue Potato Tree are considered poisonous if ingested, containing toxic steroidal glycoalkaloids. Ingestion can cause severe gastrointestinal upset, neurological symptoms, and potentially be fatal. Not safe for internal use. Handle with care, especially around children and pets.
Cultivation NotesThis plant prefers full sun to partial shade and well-drained soil. It is frost-tender and best grown in USDA zones 8-11. It can be pruned to maintain shape and size and is often grown as a shrub, small tree, or trained as a vine.
Raritycommon
Description
A vigorous, semi-evergreen shrub or small tree, typically growing 6-10 feet tall, adorned with abundant star-shaped, violet-blue flowers featuring prominent yellow anthers. It blooms profusely from spring through fall, often with some white flowers also present.
