Toni I keep most of my adeniums in the dark over the winter. I try not to store them where the temps drop below 60 but they've dipped into the low 50's numerous times with no ill effects. All my mature plants go dormant over the winter. I bring them into a well lit warm area in March and give them a shot of Superthrive to "wake" them up but don't start regular watering until they get foliage. Some are much slower then others to leaf out but all have foliage now and I'm just starting to get buds. I have had exceptions where a mature plant will hold it's leaves and bloom thru the winter in the greenhouse but even those in natural light usually drop foliage. I assume it's in response to shortened daylight hours and cooler temps. I begin feeding when they get foliage and usually use DynaGro with some Protekt and Calmag Plus mixed in. I should probably feed more often but only get around to it every few weeks. I recently fed them with Technaflora's Awsome Blossom 2:11:11 to promote flowers. I use that on most of my blooming plants but this is the first time I'm using it on the Adeniums so I'll see how it works.