Blue potato bush (Lycianthes rantonnetii)
Care, watering, light and tips for Blue potato bush on Floravia.
Quick facts
- Family: Solanaceae
- Difficulty: Moderate care
- Watering: every 3 days
- Light: Full sun
- Temperature: 10–35 °C
- Toxicity: Toxic to pets
About Blue potato bush
Lycianthes rantonnetii, known as Blue Potato Bush or Paraguay Nightshade, is a perennial shrub belonging to the Solanaceae family, native to South America. It is notable for its abundant, intense blue-violet flowers with a yellow center, which bloom from spring until autumn, creating a vibrant display. It is ideal for growing as a specimen plant, in large pots on patios, or as part of a flowering hedge in warm climates.
Native range
South America (Argentina, Brazil, Paraguay, Uruguay)
Care tips
It requires full sun exposure for optimal flowering, though it can tolerate some partial shade in very hot climates. It needs regular and abundant watering during the growing season, reducing it in winter, ensuring good drainage to prevent waterlogging. It prefers fertile, well-drained, and slightly acidic to neutral soils. A common mistake is neglecting to prune, as regular pruning after flowering encourages more compact growth and increased blooming.
How to save a dying Blue potato bush
- Warning signs
- Yellowing or drooping leaves, flowers not opening or wilting quickly, soft stems.
- First aid
- Check drainage and soil moisture. If waterlogged, remove plant, drain excess water, prune rotten roots. If dry, water deeply.
- What kills it
- Overwatering (root rot) or extreme drought in summer. Also lack of light or frost.
- Can it be saved?
- Yes, if roots aren't completely rotted and main stem is firm. Act quickly.