Bold color, tropical beauty, and easy-care mandevillas make excellent additions to patios, decks, and gardens. Train them onto a trellis, allow them to cascade from a hanging basket, or combine them with other plants. Enjoy summer-long blossoms and the butterflies, hummingbirds, and other pollinators that stop by for a visit.
Once divided into two different groups, dipladenias and mandevillas, the botanists now consider them all mandevillas. You will find both names still in use, with dipladenias referring to those with a more mounded, shrub-like habit and mandevillas being more of a trailing vine. Whatever you call them you are sure to find one or more that complement your garden and container designs.
Mandevillas are grown as annuals in all but zones 10a to 11b where some varieties are hardy. They flower best in full sun but will tolerate some shade. These South American native plants thrive in the hot humid weather of summer. Wait for spring temperatures to remain in the 60s before planting them outdoors.
Select a potting mix or location with organically rich, well-drained soil. Use a slow-release fertilizer at the start of the season and make a second application, if needed mid-season. Read and follow the label directions when using fast-release liquid fertilizers.
Mandevillas are usually flowering when you purchase them at the garden center. They will continue to bloom on new growth throughout the summer and fall until frost kills the plant.
The well-behaved vining mandevilla will not strangle nearby plants. Just give it a trellis or obelisk for the vines to wrap around and climb. Their slightly woody stems provide greater stability than other vines that regularly need to be secured to the support. Just tuck any new tendrils through the trellis, pointing them in the desired direction as needed.
Use vining varieties in a container of their own or as a vertical accent on a trellis in mixed containers or flowerbeds. Set pots by an entrance to your home or garden for a colorful welcome or use them to dress up a bare wall or fence.
The more compact shrubby types can be planted with other annual flowers in the garden, grown in hanging baskets, or used as a filler in mixed container gardens. Just prune off or tuck any wayward branches behind neighboring plants.
Disease-resistant Sun Parasol® mandevillas offer an array of colors including white, yellow, apricot, pink, crimson, and even red and white striped flowers. The original shrubby Sun Parasol® mandevillas are available in the widest range of colors while the garden group makes excellent hanging baskets. Grow the vigorous climbing Giant group varieties for the largest flowers and the Pretty group when looking for a vine with the most flowers, dense vigorous growth, and more cold tolerance.
Include them on your patio, deck, or balcony, and situate a few outside your windows. You will enjoy the flowers and winged visitors whether inside looking out or relaxing in your outdoor spaces.
Melinda Myers has written more than 20 gardening books, including the recently released “Midwest Gardener’s Handbook, 2nd Edition” and “Small Space Gardening”. She hosts The Great Courses “How to Grow Anything” DVD and instant video series and the nationally-syndicated Melinda’s Garden Moment TV & radio program. Myers is a columnist and contributing editor for Birds & Blooms magazine and was commissioned by Suntory Flowers for her expertise to write this article. Myers’ website is www.MelindaMyers.com.