I have grown Kohlerias for several years, both under lights and in natural light. It has been my experience that they really enjoy strong light and warm temps. So much so, that I put them outdoors in summer for the best bloom. Mine do begin going dormant now and I feel it is a factor of reduced day length and cooler temps.Yours may well be getting ready for dormancy, especially if it hasn't ever done so. Dormancy can be of variable length with these, from a few days to months and I am not sure what reasoning they use. The old foilage may die back and be replaced fairly quickly by new growth, especially with a constant warm temp, or not. Sorry this isn't more help, Tommie > > > >