A mandevilla plant indoor or outdoor setting works well as long as you match the right conditions to each season. This tropical vine thrives on a sunny patio during warm months. Then it moves inside for winter in most climates. You get the best results by giving your plant both experiences throughout the year.
For mandevilla outdoor growing, your vine needs at least 6 hours of direct sunlight each day. Nighttime temps should stay above 50°F (10°C) to keep the plant healthy. Put the pot on a south-facing patio or deck where it gets full morning sun and some afternoon shade. The optimal range is 65-70°F (18.3-21.1°C) per NC State Extension. Your mandevilla will grow fast and bloom heavy in these conditions from late spring through early fall.
I keep my mandevilla on a sunny patio from May through September every year. The vine covers a six-foot trellis with bright pink flowers by midsummer. Friends who visit always ask what it is because the blooms are that eye-catching. Once nighttime temps start dipping below 55°F (12.8°C) in early fall, I begin the move indoors. I've done this transition for the past four seasons and the plant gets bigger and stronger each time.
Growing your mandevilla indoors during winter means finding the brightest spot in your home. A south-facing window works best because the vine still needs as much direct sun as you can give it. Clemson Extension recommends keeping indoor night temps between 60-65°F (15.6-18.3°C) for the best results. Your plant will slow its growth during this time. Some leaf drop is normal and not a reason to worry.
The biggest mistake you can make is moving your plant too fast between environments. I learned this the hard way my second year when I hauled the vine straight from my living room to full outdoor sun in May. Half the leaves burned and dropped within a week. The plant bounced back but lost about a month of growing time. That's a month of blooms you won't get back.
You need to acclimate your plant over seven to ten days when moving it in either direction. Start by placing it in a shady outdoor spot for the first two days. Then give it two to three hours of morning sun. Add another hour of sun each day until it handles full exposure. The same gradual process works in reverse when you bring it back inside for winter. Your plant adjusts without dropping its leaves this way.
Indoor plants need less water than outdoor ones since the soil dries out slower away from wind and direct heat. Check the top inch of soil with your finger before watering. If it still feels damp, wait another day or two. Too much water leads to root rot when your plant sits indoors. Give your vine a spot away from heating vents that can dry out the leaves too fast. You can also set the pot on a pebble tray filled with water to boost humidity around the leaves without soaking the roots.
Your mandevilla can live as both an indoor and outdoor plant for many years with the right care. Give it sun, warm temps, and a gradual transition between settings. You'll enjoy big tropical blooms on your patio all summer and a healthy green vine by your window all winter long. The key is treating your plant as a partner that moves with the seasons rather than a fixed fixture in one spot.
Read the full article: Mandevilla Plant Care and Growing Guide
