I am leaving in Kolkata, India, usually in a hot and humid climate. I am interested in Orchid growing just two years back, despite all efforts my Orchids are not flowering as it should be and they are not enough green or healthy. Recently I had purchased one vanda from a reputed nursery, this was very healthy and dark green. Usually I used to hang my Orchids in my east facing veranda, where they get sunlight for 2 to 3 hours. I fertilize with NPK fertilizer once in a week, and use one fungicide also once in a week. After two weeks, I found wrinkle and yellow tinge on vanda leaves. Pl advise.