Are Dipladenia Perennials? And How to Overwinter Them

Dipladenia is a true perennial, but only in places that never or rarely freeze. In most gardens it’s sold and treated like a summer annual.1Costa Farms. Dipladenia Whether yours comes back depends less on the plant than on what you do before the first frost. An ordinary pot can be carried through winter indoors, either kept growing or put to rest, and set back out next spring to bloom again.

Where Dipladenia Survives Winter Outdoors

Dipladenia comes from Central and South America,2Blooming Backyard. 6 Things Everyone with a Dipladenia (Mandevilla) Needs to Know so it cannot tolerate frost.3Costa Farms. Dipladenia That limit means it is rated perennial only in USDA hardiness zones 9–11.4Gardening Know How. Gardening Know How

Where frost is absent or very rare, dipladenia stays evergreen and flowers on and off all year.5Thursd. Dipladenia Plant, the Equally Charming Mandevilla Twin In a cold-winter area, it is best treated as an annual or brought indoors before the cold arrives.6Costa Farms. Dipladenia Even indoors it needs temperatures that stay above 10°C (50°F) in winter.7Annals of the „Constantin Brancusi” University of Targu Jiu, Engineering Series. STARTING A BUSINESS BY SETTING UP A GREENHOUSE FOR GROWING ORNAMENTAL PLANTS

To find your zone, look up your postcode on the USDA map or your country’s national hardiness map. Zone 8 gardens get occasional frosts, and those can still kill the plant outdoors. Pots are also more exposed than garden beds: the roots sit above ground, so a potted plant freezes faster than one planted in soil.

A zone describes a typical winter, not the worst your area could produce, so a cold snap can still happen in zones 9–11. If you’re near the edge of the range, watch the forecast on cold nights and cover or move pots rather than trusting the zone alone.

Overwintering isn’t always worth the effort. A large, established plant saves you the cost of buying a new one each spring, and it starts the next season bigger and blooms sooner. But if you have no sunny window or cool room, treating it as an annual is a fair choice, especially with a small, cheap plant that is easier to replace than to store.

When to Bring Dipladenia Indoors

Bring the plant indoors while it is still warm out rather than waiting for the first frost,8Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them because a single frost can kill it.9Costa Farms. Dipladenia Stop fertilizing in fall as growth naturally slows.10Thursd. Dipladenia Plant, the Equally Charming Mandevilla Twin That way the plant isn’t pushed into soft new growth just before it moves inside.

Start preparing when night temperatures drop toward about 10°C (50°F). If a surprise cold night does catch you, a garage or porch can shelter the pot temporarily. Choose a mild day for the move to reduce shock.

Plants can carry pests inside with them. Check leaf undersides and stem joints for tiny moving dots or fine webbing, and pull fallen leaves and debris off the soil surface. A few days before the move, rinse the whole plant with a strong spray from the hose. For the first couple of weeks indoors, keep it apart from your other houseplants.

Overwintering Dipladenia as a Houseplant

Prune the plant to a more manageable size before bringing it in,11Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them then place it in a south-facing window,12Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them since it needs a well-lit spot.13Annals of the „Constantin Brancusi” University of Targu Jiu, Engineering Series. STARTING A BUSINESS BY SETTING UP A GREENHOUSE FOR GROWING ORNAMENTAL PLANTS Water it regularly through winter.14Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them

A south-facing window gives the longest and strongest winter light, which makes it the best choice for a plant you want to keep growing. A west window can work, but expect more stretching and fewer flowers. Sit the pot close to the glass, because light drops off quickly a short distance into a room, and turn it every week or two so all sides get light and the plant doesn’t lean.

Check the top few centimetres of soil with a finger before watering. When it feels dry, water thoroughly until water runs out the bottom, then empty the saucer. Soggy soil in a cool winter room leads to root rot. Yellowing and dropping leaves can mean too much water or too little, and the soil check is one clue to which. Some leaf drop after the move is normal adjustment.

Dipladenia can bloom much of the year but tends to stop in January and February.15Elsevier. Effect of temperature, daylength and light intensity on growth and development of Dipladenia sanderi Hemsl. ‘Rosea’ Low light in November and December keeps buds from developing.16Elsevier. Effect of temperature, daylength and light intensity on growth and development of Dipladenia sanderi Hemsl. ‘Rosea’ A flowerless midwinter plant is normal, not failing. Indoor plants need little to no fertilizer until spring growth resumes.17Thursd. Dipladenia Plant, the Equally Charming Mandevilla Twin

Dry, warm air invites spider mites. Plants in very warm spots, such as under a heating vent, are especially prone to them, and underwatered plants are more susceptible too.18Mississippi State University Extension Service. Insect Pests of Houseplants Keep the pot away from vents and don’t let it dry out completely. Stippled, pale leaves with fine webbing signal mites, and rinsing the leaves in the shower helps knock them back.

Storing Dipladenia Dormant in a Cool, Dark Place

A third option is storing the plant in a cool, dark location.19Melinda Myers. Three Ways to Overwinter Mandevilla, Dipladenia Wait until outdoor temperatures drop into single digits Celsius but before frost,20Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them then cut the plant back hard to about 35 cm (14 inches).21Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them Store it where it stays around 10°C (50°F), such as a basement or heated garage.22Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them It does not need direct sunlight while resting.23Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them

Water just enough to keep the roots from drying out.24Melinda Myers. Three Ways to Overwinter Mandevilla, Dipladenia That means maybe once a month, depending on conditions,25Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them so you can basically leave it alone all winter.26Toronto Master Gardeners. Are Dipladenia Perennials? And How to Overwinter Them

The spot must stay cool but not freezing, because frost kills the plant even when it is cut back and resting. An unheated garage can work in mild winters, but garages can freeze, so check the coldest corner on the coldest nights, and keep in mind the plant needs temperatures above 10°C (50°F). Leave a thermometer there for a week or so to see whether the space really holds near 10°C (50°F). Avoid spots beside a furnace, where the plant would warm up and dry out instead of resting.

Expect the plant to drop most of its leaves, which is normal. The stems should stay firm, not shrivelled or mushy. Mushy stems usually point to too much water or too cold a spot, while bare stems that are green inside are still alive.

Moving Dipladenia Back Outside in Spring

Spring is the time to fix a plant that got leggy indoors.27Tropical Plants of Florida. How to Overwinter Mandevilla & Dipladenia Indoors (And When to Move Them Back Outside) Remove weak, thin stems, and trim long stems for shape and fuller branching.28Tropical Plants of Florida. How to Overwinter Mandevilla & Dipladenia Indoors (And When to Move Them Back Outside) Resume feeding once active growth starts.29Thursd. Dipladenia Plant, the Equally Charming Mandevilla Twin It’s also a good moment to refresh tired soil. Use a fast-draining mix of 2 parts potting mix to 1 part perlite or pumice, in a pot only slightly larger than the old one and with drainage holes. Water lightly until new growth shows.

Wait until night temperatures stay above about 10°C (50°F), not just the daytime highs. Check the average last frost date for your region, then allow a margin, since late cold snaps do happen. If a cold night is forecast after the plant is out, carry it back inside for that night. A plant that has been resting can be watered more and moved into light a few weeks before going out, so it wakes up and starts growing.

Indoor leaves are tender and can burn in sudden full sun,30Tropical Plants of Florida. How to Overwinter Mandevilla & Dipladenia Indoors (And When to Move Them Back Outside) so move the plant out in stages:

Dipladenia or Mandevilla

Dipladenia is related to mandevilla and often sold under that name. Mandevilla climbs, while dipladenia is shrub-like with stems that hang down.34Gardening Know How. Growing A Dipladenia Plant – Learn The Difference Between Dipladenia And Mandevilla Dipladenia tends to stay around 18 inches tall while mandevilla vines as far as you let it.35Houseplant Homebody. Mandevilla & Dipladenia The leaves differ too: dipladenia’s are smaller, thicker, glossy and pointed, and mandevilla’s are larger and broader.36Gardening Know How. Growing A Dipladenia Plant – Learn The Difference Between Dipladenia And Mandevilla

Tags often say mandevilla even on bushy plants, so the label alone isn’t a reliable guide. A mounded plant trailing from a hanging basket is likely dipladenia, and long twining stems climbing a trellis point to mandevilla.

Care is the same. Both are frost-tender tropicals and are overwintered the same three ways.37Melinda Myers. Three Ways to Overwinter Mandevilla, Dipladenia The practical difference is size: a mandevilla’s long vines take up more indoor space and need harder pruning to fit.

Is Dipladenia Safe Around Pets and Children

Dipladenia isn’t on the ASPCA’s list of plants known to be poisonous, but eating any part might cause digestive upset, and its sap can cause some irritation.38A-Z Animals. Is Dipladenia A Perennial Or Annual? Wear gloves when pruning and keep the plant out of reach of pets that chew plants.

Cutting stems releases milky sap. If it gets on your skin, wash it off with soap and water, keep it away from your eyes, and wash your hands before touching your face. Indoors, place the plant high or in a room pets don’t use, and sweep up fallen leaves that curious animals may eat. If a pet vomits after chewing it, call a vet.