Here's some more on fertilizing orchids in the winter from Ron Ciesinski of Taylor Orchids in Monroe, Michigan. He grows thousands of orchids and is just about to quit fertilizing most of them until March. "They don't grow in winter, even under lights. When they start growing again, usually in March, I use a high nitrogen fertilizer. Then once the new leaves are formed I switch to one with lower nitrogen, such as 6-30-30 and keep that up into fall, blossom booster or something like that especially in September and October. Might cut to half in winter, December, hold off entirely especially in January, start up again in March. Steven