The large white, pink or red flowers of the mandevilla, sometimes called the rose dipladenia, appear atop the emerald green leaves in lots of sunlight. Make sure your garden location or container has fertile, well-draining soil that isn't alkaline in pH. In hot summer regions, ensure it gets a little shade in the heat of midday. It will return year after year in U.S. Department of Agriculture hardiness zones 9 and warmer.
Buy the vine in late spring, about the time of your area's last expected spring frost date. If there is an indoor greenhouse or house plant area, the vendor might have new potted mandevilla plants from April until mid-summer.
Look for robust, staked mandevilla plants at the nursery. Most often they'll be in 3-gallon black plastic pots, with a diameter or 10 to 14 inches. Smaller-size plant pots are OK, but will take a little longer for the smaller vines to grow large; they typically cost less, too.
Look at the leaf undersides, noting any problem insects like scale or mealybug. Don't buy a plant with resident pests.
Evaluate the plants before buying. Note which has the best-colored leaves and amount of vigorous new twining tendril tips. Look for roots pushing out of the container's drainage holes. Roots emerging indicates an over-crowded root system. It also may lead to the plant wilting prematurely because there's not enough soil in the container for the roots.
Lift the selected mandevilla by the rim or bottom of the container only. Never carry it by the trellis or stems, as it will break and drop to the ground.
Ask for a paper sleeve or snug box to transport the plant home. These prevent stem or leaf breakage on the car ride home as well as it tipping over when you make a sharp turn in the car. It also prevents soil from trickling out of the container's holes and staining upholstery and dirtying floor mats.