How to winter a Mandivilla?

https://www.gardeningknowhow.com/ornamental/vines/mandevilla/winterizing-mandevillas.htm this is a how to winterize web site

What zone are you in, and is the Mandevilla in the ground or a container?

Check with your local nursery.

I tried, they died.

Hi Morris. I have tried 2 times, and had no luck. Last year I was very close but the got a puppy in spring and she ate all of the new growth on it and then it died. What I do is put it in the basement and water it once a week. Mine lost all of the leaves which was fine since it was going dormant. In spring I brought it upstairs into a room with a lot of sunlight and started watering it a few times a week and fertilizing it every week. Good Luck!