Hi There,
Welcome to the plumeria board. Someone will come in soon that puts their plants under lights.. I don't..can't help. Don't think you water much..need someone to clear this for you..

Last year bought my plants inside, many didn't lose their leaves. They stop growing and start up in warm weather in spring when they can go outside.
Karen B.

No, you don't have to let your plant go dormant, they usually do it on their own. Some times if mine get an inflo in late fall and they go dormant the inflo will hang on till it starts growing in the spring.
I almost missed this post because I thought the question had been answered.
Good luck on your Plumeria!

I am new to the board and seached for the answer for a while.
I am hooked on them, i was oof on medical and got some cuttings on QVC and have bought some on ebay and even started seads. since the weather here got colder i brought them in and one is starting the flower inflow? I got 120watt bulbs and so far so good.

on the gulf coast you dont have to winter, just bring them inside during cold fronts or when temps stay below 50' for more than a few days. just keep it from freezing.

but if you want it to keep growing, keep it warm and give it lots of light.

what type of bulbs are you using? flourescent tubes? i have an orchid that ill be bringing inside and putting under a huge CFL 65watt bulb later on. might put my plumie next to it.

I've got my Kona Cranberry indoors under a shop light fixture with two GE plant 40W Floresent bulbs and they are doing okay. It's blooming but the leaves are having some stress growth problems and growth is slow, flowers are small too (but that may be characteristic of the Kona C?).