Vinca

• Watering it on the same schedule as a nearby lawn or thirsty tropical bed — vinca wants to dry out between waterings, and consistently wet soil is the single most common way to lose it to root rot.
• Planting it in a low spot where irrigation water collects — even brief waterlogging encourages the stem and root rot it's most vulnerable to.
• Choosing an older, non-disease-resistant variety without checking — modern series bred for heat and humidity resist the fungal stem rot that troubled earlier vinca varieties.
• Treating it as a perennial and expecting it to survive through a Dubai winter outdoors — it's grown here as a one-season summer annual and is typically replaced once it fades in autumn.
• Planting it where children or pets might pick and chew the flowers — all parts of the plant are toxic if eaten, so site it out of easy reach in a family garden.

• Dubai Municipality plants vinca in its May–June summer bedding rotation specifically because it tolerates peak heat that finishes off winter flowers like petunia.
• It is the natural source of vincristine and vinblastine, two chemotherapy drugs, which shows how potent the plant's alkaloid compounds are — a reminder to keep it away from anyone who might eat the leaves or flowers.
• Modern disease-resistant series are a meaningful upgrade over older varieties for UAE conditions, given the region's occasional humid spells that favour fungal stem rot.
• It is largely self-cleaning, dropping spent flowers on its own, which makes it lower-maintenance than bedding plants that need regular deadheading to keep flowering.

Toxicity: All parts are toxic if eaten — it is the source of the chemotherapy drugs vincristine and vinblastine. Keep it away from pets and children, and don't compost it near vegetable beds.