Mandevilla won’t survive very long outside during winter unless you live in an area with warm temperatures. In areas where temperatures dip below 40℉ (4℃), mandevilla wilts and dies in a matter of days. A hard freeze during cold weather kills mandevilla instantly. Therefore, this bright-colored, beautiful vine should be wintered indoors if possible.
Can You Leave a Mandevilla Outside in Winter?
Whether or not you can leave mandevilla outside during the winter months depends on your location. If you live in an area where temperatures dip below 40℉ (4℃), either overnight or during the day, this vine should not be left outdoors during winter. Any temperatures below this point are deadly to mandevilla.
- Mandevilla only survives outdoors year-round in warm weather.
- If temperatures dip below 40℉ (4℃), this vine should be moved inside.
- Mandevilla can be left outside during winter if no frost occurs in that area.
Mandevilla can endure winters outside only in areas that do not experience frost. Leaving this tropical vine outside during the cold winter months will result in its death.
How Do You Winterize a Mandevilla Vine?
There are two ways to winterize a mandevilla vine. The first option is moving it indoors. If you have a large sunny window, that gets a lot of bright sunlight, bring your vine inside as soon as temperatures drop. Feel free to prune your vine back until it reaches a comfortable size for your dwelling. In February, prune it again and add some additional fertilizer to the soil. If you choose this option, try to keep the indoor temperature no higher than 75℉ (24℃). Otherwise, your plant might get too dry.
- You can winterize a mandevilla vine by simply bringing it indoors.
- Keep the inside temperature no higher than 75℉ (24℃).
- You can also let your mandevilla vine go dormant.
- Cut the vine back and move it to a non-freezing location until spring.
The second option for winterizing your plant is to allow your mandevilla vine to go dormant. When outside temperatures dip, move it to a basement or cool garage, where the temperatures stay above 50℉ (10℃). Cut the vine back to approximately 12 inches (30 cm) in height. All your mandevilla needs until spring is occasional watering to prevent it from drying out. Then, relocate it outdoors when temperatures warm up to about 60℉ (16℃).
What is the Lowest Temperature a Mandevilla Can Tolerate?
Mandevilla vines prefer temperatures of at least 60℉ (16℃). Some experts say that mandevilla vines should not be exposed to temperatures under 50℉ (10℃). However, they have been known to survive in climates as low as 40℉ (10℃), although this is not an ideal temperature for this plant. Short-term exposure to such temperatures will not usually harm these vines.
- Mandevilla vines will not survive in temperatures lower than 40℉ (10℃).
- Consider bringing your vines indoors during cold months to avoid frost damage.
Mandevilla vines will not thrive and bloom to their fullest potential in cold environments. To avoid exposing your plants to frost, bring them indoors as soon as cold weather approaches.
Can a Mandevilla Survive Frost?
Depending on how low the actual temperature goes, it is possible for a mandevilla vine to live through a light frost. However, it’s important to understand that this is only if the air temperature rises above 40℉ (10℃) very quickly afterward.
- Mandevilla vines sometimes survive a light frost.
- If temperatures quickly go back up to 40℉ (10℃) after a frost, the vine will probably recover.
- It’s better to err on the side of caution and bring your vines inside if a frost is imminent.
Even a light frost might damage your vine, though. For this reason, it is best to err on the side of caution. Bring your mandevilla plant inside or winterize it in a garage or basement where the temperature doesn’t dip below 50℉ (10℃).
Will a Mandevilla Come Back After Winter?
If you protect mandevilla plants from frost, they will grow new leaves in spring. In many cold regions, mandevillas are grown as annuals. They are allowed to die in winter and are replanted in spring. However, you can grow mandevillas as perennials by keeping them from freezing temperatures.
- If protected from frost, mandevilla vines will come back naturally after winter.
- Mandevilla vines are considered annual in many locations, but they can be grown as perennials.
- Cut your mandevilla vines back to approximately 12 inches (30 cm) in the fall for the best spring growth.
If you are planning to grow your mandevilla vine as an annual, prune it back when temperatures begin dropping. Don’t be afraid to cut it down to approximately 12 inches (30 cm) tall. This will help it bloom bigger and stronger in the spring.
How Cold Can a Mandevilla Tolerate?
Mandevilla vines thrive in hot, humid climates since they are tropical plants from Brazil. They do not survive very long outside during cold seasons. In regions where temperatures reach 40℉ (10℃), mandevilla wilts and dies quickly. A hard freeze instantly kills this vine.
- Winter mandevilla vines indoors.
- Cut the vine back to an appropriate size before taking it inside.
- These vines grow slowly during winter and this is normal.
- Water mandevilla vines to prevent the soil from drying out before spring.
If you protect your mandevilla plant from low nighttime temperatures, it will produce showy flowers for years to come. If you place it in a warm, sunny window, it will remain green all winter.