How do you get the flower in the hospital wing for Lego Harry Potter wii year 2?

To get the flower in the hospital wing in LEGO Harry Potter for the Wii during Year 2, first, use a character with the ability to cast the "Alohomora" spell to unlock the door to the area. Once inside, look for a plant that can be watered. Use a character with the "Water" spell to water the plant, which will cause it to grow and reveal the flower you need. Collect the flower to complete that task.