Three Ways to Overwinter Mandevilla, Dipladenia
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. That means the rest of us need to overwinter it indoors if we want to save the plant for next year’s garden.
If indoor growing space is limited, consider taking 4 to 6” cuttings. Dip the cut end in a rooting hormone and stick it in moist vermiculite or a well-drained potting mix to root. Then plant it and grow it like a houseplant.
Or move the whole plant indoors in front of a sunny window and grow it like a houseplant. Water thoroughly when the top inch of soil is starting to dry.
A third option is storing it in a cool dark location. Water just often enough to keep the roots from drying out.
A bit more information: Be sure to quarantine any plants you move indoors before adding them to your indoor garden. Monitor the plants for several weeks, watching for any pests that may have hitched a ride inside on the plant.