If Hoya obtusifolia flowered when the day length shortened, why couldn’t I achieve that same thing under lights? I moved the plant out of one grow tent with 15 hour days and moved in to another with 12 hours of light and 12 hours of dark. It immediately began to bud up, making me confident enough to tell my friend Julie Kennedy that I was going to flower the plant in a couple of weeks. I spoke much too soon!