Also known as Bright Eyes, Cape Periwinkle, Graveyard Plant, Rose Periwinkle
Madagascar periwinkles produce glossy, dark green foliage and flat, five-petaled flowers ranging from white and pale pink to deep magenta, often marked with a contrasting central eye. Indigenous to the dry coastal forests of Madagascar, this resilient evergreen subshrub thrives in heat and poor soils across tropical regions worldwide. It synthesizes complex vinca alkaloids as a defense against herbivores, compounds that scientists famously extracted to create life-saving chemotherapy medications.
Life spanPerennial (often grown as a tender annual in temperate regions)
Size / weightNot available
Classification
OrderGentianales
FamilyApocynaceae
GenusCatharanthus
SpeciesCatharanthus roseus
Range & activity
Range data is not available yet.
Safe observation
Interaction riskHigh
Low
Moderate
High
Very high
Why interaction risk is high
All parts contain toxic alkaloids if ingested; keep away from pets and curious children.
Why it is dangerous
Contains powerful vinca alkaloids including vincristine and vinblastine that cause systemic toxicity, severe gastrointestinal distress, and neurological issues if ingested.
How to recognize a risky encounter
Look for glossy opposite leaves with a pale central vein and flat five-petaled flowers featuring a dark central eye.
What to do
Wear garden gloves when trimming to avoid sap contact, and never consume any part of the plant.
What to notice
Recognize native wild populations by their compact growth in sandy coastal scrub and dry woodland remnants of Madagascar.
Support conservation
Avoid collecting seed or wild plants from natural habitats; obtain specimens strictly through commercial plant nurseries.
Responsible observation
Garden Placement: Plant in full sun and well-drained soil where roots stay warm, as wet cold conditions trigger root rot.
Pruning Practices: Pinch back young stem tips early in the growing season to encourage bushy branching and abundant flowers.
Pet Safety: Keep indoor potted specimens elevated well out of reach of cats and dogs to prevent accidental plant poisoning.
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