I have been bought an orchid for my birthday. I am only watering it once a week (leaving it to soak for ten minutes and draining). It is in a clear pot away from direct sunlight but on a window sill. Is there anything else I need to know to keep it healthy and to stop it from dying? I have had it for about six weeks and it is still flowering. In particular, I would like to know what to do when the flowers drop off, do I need to prune?