Thankfully, I store my dormant plumeria in my basement, along with my other tropical plants. My garage is bone chilling cold right now. We're at 15 degrees and dropping to a low of 7 degrees tonight, and the wind chill will be minus whatever.
I'm glad that I have the room to keep the plants safe. I'm so sorry to hear that you lost so many plants 3 years ago.
Annette
