Every year as winter draws closer we receive a lot of the same question…
“What can I do or how do I take care of my mandevilla during the winter.”
Mandevilla vine has become a very big spring blooming crop, and is usually grown on a trellis, outdoors on a deck, patio, sun porch, etc.
As the nights begin to cool off the Mandevilla will slow down. That is the time to give them some food to harden them up for the long winter.
Try to use a liquid feed with a high middle number e.g. 10-56-14, (Lightly) since you can cause fertilizer burn. We are not trying to promote growth but to toughen the plant up.
Don’t go over board with the fertilizer; let the plant stay outside as long as possible. It should be able to handle high 40’s for brief periods.
After about 3 weeks (if you can hold out that long weather permitting) prune the plant back. Not just tipping the plant but cutting it down to about 12 inches above the soil line.
I would also treat this vining plant for any possible pests problems since it will be going indoors for the winter.
Next we want to begin slowing up on the water and let the plant run on the dry side. Remember, we have given the plant some fertilizer and removed a lot of growth so the requirements for water should drop.
Indoors Maintenance Not Growth
When you bring the plant inside place it in as much light as possible. You are looking for maintenance not growth.
You’ll probably get some quick new growth, just try to maintain it. Some people place the plant in a clear plastic bag and over wintered their Mandevilla in their heated garage.
Try to maintain the plant on the dry side throughout the winter.
Moving Mandevilla In Spring
When spring comes you can move the plant outside. Expect the growth produced during the winter to be burned off!!!
Although, we cannot guarantee the above method will work you, it is a guideline that has worked for others over the years you can try.
I hope that helps…. good luck. Let us know how you do.