How to care for your Dendrobium Orchids: Upon receiving your dendrobium orchid flowers, inspect all flowers, take them out of the box and remove all packaging and water tubes if present. Hold the ends of the stems underwater and trim them diagonally at least ¼ inch from the ends using a sharp knife. Place your orchid flowers immediately in clean vases or containers with lots of fresh water. Keep the flowers in a dim location, away from direct sunlight, draughts or excessive heat. To maximize vase life, re-cut the stems and change the water in the vases every day using the above steps. TIP: Orchids don’t like to be too cold! The optimal temp to keep orchid flowers is around 65 degrees F.