The best way to water a Bromelia is by pouring water into the plant’s cup or central rosette, the heart of the plant where the flower grows from. Once the water is no longer visible, it is time to water the plant again. It is also important to keep the potting soil slightly moist. A Bromelia usually only needs water once every 2 to 3 weeks, making it an ideal plant if you are going on holiday and do not have someone to look after your plants.