I agree with Kelly and Cynthia- cutting the foliage will not harm them permanently. My Habranthus and Zephyranthes thrive on benign neglect. If it were me I would be more prone to cutting them back than leaving them 6 months. Most varieties would survive the dormancy, however there might be a couple that are pickier than others. Still, the indoor room would be safer than trusting a large collection to the weather. How exciting to design in that part of the tropics! It sounds like a very fulfilling project. Erin Grace Thomasville, Georgia