Sold Out Mandevilla is a sun-lover, scrambling upward by way of tendrils, so you don’t have to bother yourself with the tedious chore of tying the climbing shoots. Just provide a convenient trellis, arbor, fencepost or other structure and the plant will do the rest.
Known for its showy 3-5" flowers, the genus Mandevilla includes plants that were formerly called Dipladenia. There are about 100 species of tropical, flowering vines belonging to the Periwinkle family, Apocynaceae. These plants are natives of Argentina. The vines can climb to over 20 feet by means of curling tendrils on a trellis or pole. They have glossy dark green leaves.
If you have an eyesore on your property (garbage cans, utility area, the view of your neighbor’s garage) that needs screening, all the better. In the absence of rain, water the plant when the soil appears dry, and feed it periodically throughout the blooming season. Remember the general rule: anything that blooms heavily tends to feed heavily.
When fall comes, you do not have to bid your Mandevilla farewell. Cut it back, pot it up (if it’s not already in a pot), and take it inside. Place it in a south-facing window, or the sunniest spot in your house, and water regularly. There is no need to fertilize until it goes out again in the spring. As with most outdoor plants that overwinter indoors, the Mandevilla will grow slowly and probably not blossom. That’s all right, you will have Amaryllis and African violets and kalanchoes for that. The glossy green leaves should remain to remind you of the glories of the summer blossoms.
Most species overwinter only in the tropical South where temperatures stay above freezing. In northern locations they can be treated as annuals or grown indoors. They can be brought indoors before the first freeze and treated as a houseplant during the winter months. In the spring, Mandevilla can be returned outside after the last spring freeze or after the threat of freezing weather has passed. Mandevilla is great trellised in containers or in hanging baskets.