Hi Jess. Your Den is a very nice shade of mustardy yellow. It's a Yamamoto hybrid. OrchidWiz says it only needs a reduction in watering and no fert during the winter months. Cooler temps will set the buds. I have a couple of Yamamotos. I put them out in my detached quilting studio from Halloween until Valentines Day. They get watered once a month with plain water during that period. They sit in a west window, and them temps in the studio during the winter are in the low to mid 50s, sometimes cooler. The heat is only on when I'm working out there. The key is the combination of bright light and cool temps.
