Madagascar periwinkle, Catharanthus roseus (Vinca rosea)
Quick facts and care essentials
• Full sun or partial shade
• Moderate watering
Phloxlike flowers bloom in shades of pink, rose, lavender, and white on plants 4 to 24 inches tall, depending on the variety. Thrives in hot conditions, whether dry or humid. Space 8 to 12 inches apart.