Vinca, Annual

Scientific Name: Catharanthus roseus

Common Names: Madagascar Periwinkle, Vinca, Rose Periwinkle

Native to: Madagascar

Lighting Requirements: Full sun to partial shade. It thrives in full sun but can tolerate some shade, especially in hotter climates.

Height: 8 to 18 inches 

Width: 8 to 24 inches 

Winter Look: Typically grown as an annual in most climates, dying after the first frost. Will reseed itself when happy.

Seasonal Interest: Spring to fall, with continuous blooming during warm weather

Drought Tolerance: High. Catharanthus roseus is drought-tolerant once established and thrives in hot, dry conditions.

Soil Requirements: Well-draining, sandy or loamy soil. It performs best in soils with low fertility, making it highly adaptable to challenging conditions.

pH Range: 5.5 to 7.5 (slightly acidic to neutral)

Hardiness Zones: USDA Zones 10 to 11 (grown as an annual in cooler zones)

Deer Resistance: High. Deer rarely browse on Catharanthus roseus, making it a great choice for deer-prone areas.

Attracts: Pollinators such as bees and butterflies

Toxicity: Toxic to pets and humans if ingested. Contains alkaloids that can cause gastrointestinal distress or more severe symptoms in large amounts.

Potential Issues: Generally pest- and disease-resistant, but overwatering can lead to root rot or fungal diseases like botrytis. 

Notes: Catharanthus roseus is a popular choice for hot, sunny gardens due to its vibrant, five-petaled flowers in shades of pink, white, red, and purple. Its glossy green foliage provides a lush background for the continuous blooms. This low-maintenance plant is often used in borders, containers, and as a ground cover. Known for its heat and drought tolerance, it is perfect for areas with challenging growing conditions. Avoid overwatering, as it prefers well-draining soils and can withstand dry spells. This plant is not only valued for its beauty but also for its medicinal properties; it has been used in pharmaceuticals to treat various diseases, including cancer.