That means the rest of us need to overwinter it indoors if we want to save the plant for next year’s garden. IN order to climb, a mandevilla needs a trellis. However this will depend on how cold the garage gets in winter, as the Mandevilla genus are tropical or semi-tropical plants that are unlikely to survive temperatures below 10 degrees C. Below are are a couple links to previous questions (and answers) on the TMG site relating to overwintering Mandevilla. It is a good practice to prune your Mandevilla plant by pinching. Mandevilla vines climb up vertical structures to seek the canopy light. To prune your Mandevilla, simply pinch off ¼ to ½ inch of the end of the each stem using your fingers. Bring mandevilla inside before temperatures drop below 50 … They are generally grown on trellis. Mandevilla, now botanically known as Dipladenia, is a popular vine with shiny green leaves and trumpet shaped flowers in red, white, pink, yellow or apricot.This tropical vine is only hardy in frost-free areas. Ensure that the room temperature is above 60 degrees F. They don't tolerate frost, so if you live in a cold-winter climate, it's best to consider these exotic annuals or bring them indoors … It is generally grown as a vine but can also be pruned to maintain a shrub-like upright shape. The room temperature. For the best care of your Mandevilla, make sure to provide it some sort of support. This will give you a fuller, bushier plant. So how do you grow mandevilla vines so you, too, can enjoy these tropical-like plants? (Answer) It might be possible to winter the Mandevilla in your garage. The Spruce / Phoebe Cheong How to Grow Dipladenia and Mandevilla . Many mandevilla vines can be seen on porches, patios and decks. Mandevilla (Mandevilla x amabilis) is a hybrid that grows to be a large vine reaching 8 to 10 feet tall. You can treat Mandevilla as a houseplant or store it in a dormant stage. We can help with that. The tips and information below includes all you need to care for mandevilla plants in the garden, as well as indoors. Mandevilla flowers add a tropical flair to nearly any landscape. The Mandevilla is a frost-tender perennial, even though most gardeners think of it as an annual plant. Wipe the plant’s leaves with a damp rag or wet paper towel before bringing it indoors.Place the plant in bright, indirect sunlight and water as needed when the top 2.5cm of soil begins to dry. Houseplant : The plant can be trimmed back to make it more manageable. The larger the plant the larger the container and trellis should be, at least half as big as the plant. If your Mandevilla is free of these listed pests then continue to bring your plant indoors but if pests are discovered then treat before moving your plant on the inside. Dipladenia and mandevilla thrive in full sun and moist, well-drained soil. Indoor Winter Care Mandevilla will not live outdoors if temperatures drop below 45 degrees in winter. Gardeners must ensure they check the plant for pests before bringing it indoors. Dipladenia is a bushier plant whose stems grow down and hang. When container grown, simply move mandevilla indoors. Mandevilla vine is a popular plant many people grow in their homes and gardens. (Walter Reeves for The Atlanta Journal-Constitution) Mandevilla (Mandevilla splendens) is native to Brazil. While it’s sometimes grown indoors, it’s most commonly grown outside, using a trellis. It has glossy leaves and striking trumpet shaped flowers. Dipladenia is in the Mandevilla family but has a decidedly different growth pattern. Mandevilla or Dipladenia. 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