What's On the Page1 Understanding Mandevilla Plants7 Additional Tips for WinterizingMandevilla Clematis Red Star Propagation. Over Wintering Mandevilla. Impatiens Niamniamensis Propagation. WinterizingMandevillas: Tips For Overwintering A Mandevilla Vine. NOTE: WinterizingMandevilla involves pruning or pinching your plant. You will encounter milky sap (like a Poinsettia) that can irritate your skin and is toxic to ingest. They are cured when they become lightweight, harder, light brown and the seeds rattle when shaken. I live downtown and have planted mandevillas in my backyard. WinterizingMandevillas#. If you’re short on bright light or space, you can bring the mandevilla indoors and store it in a dormant state. Read more at Gardening Know How: WinterizingMandevillas: Tips For Overwintering A Mandevilla Vine. pink mandevilla bloom The mandevilla is known for its showy flowers. There are about 100 species of this tropical American woody vine.Protecting Or Winterizing Your Mandevilla · Learn how to overwinter mandevilla, including two overwintering options, what to do after you have brought it indoors, and whether or not you should cut it back for winter. · There are a couple different ways you can care for a mandevilla over winter so you can grow it again next summer. I’ll walk you through when and how to overwinter a mandevilla so you can enjoy its beautiful blooms and dramatic vining foliage for years to come. · Don't let frost kill your beautiful mandevilla! Here's how to overwinter your vine indoors so it returns strong and healthy in spring. · By learning how to winterizemandevilla plants, you can ensure their survival and enjoy their radiant blooms year after year. This guide covers everything from timing and essential tools to step-by-step processes, helping you give your mandevilla the best possible care during the colder months. · Water the plant weekly to keep the soil moist and prevent it from drying out. Avoid over-watering plants (only water when the top two inches of soil are dry) and don't fertilize mandevilla during winter. Come late winter, start to prepare the plant for the new season. · Here are 5 ways to overwinter a Mandevilla plant or vine: Bring the entire plant into your home and grow it in a container. Shelter the entire vine in your home with a trellis or staking. Move your Mandevilla plant into a heated greenhouse. Take cuttings of the plant and bring them inside. · This comprehensive guide will provide you with all the essential steps on how to winterize your mandevilla plant, ensuring its survival and vibrant return in the spring. Step 2. Bring the mandevilla indoors when overnight temperatures dip to 45 F. This is roughly about the time that most people begin closing their windows and turning on the heat.