Annual vinca or periwinkle (Catharanthus roseus), aka Madagascar vincas, is a summer flowering annual popular in Southern and Midwest gardens (USDA hardiness zones 9-11). Before setting out spring transplants, wait until soils have warmed up and all threats of frost have passed. The arrival of summer heat and humidity is when vincas bloom heaviest. Vincas […]
Archive for May 26th, 2025
Vincas/Annual Periwinkle Thrive In Hot Summer Gardens
Posted by Hugh on May 26th, 2025
Posted in acidic soil, Annuals, Attracting Butterflies, Bees and other pollinators, Catharanthus (Vinca), Container garden, Disease resistant, Disease resistant, Fall Garden Interest, Fertilizing plants, Flower Arranging, Flowers, Fruits poisonous, Landscape ideas, mulching, Non-native, Planting tips, Poisonous or toxic, Powdery mildew, Propagation (Seed), Purchasing Plants, Slugs, Soil drainage, Southern Appalachian Region, Spring flowering, Summer flowering, Summer heat tolerant, watering tips, winter hardiness 
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