What makes this product unique is the removable dish which holds the bulb in place. Sitting on top of the vase, this dish, which has a hole in the bottom of it, allows the rhizome’s root structure to grow through it. Plus, it’s hassle-free to change the water. Just simply lift the dish with bulb in it off the top of the vase, empty and replace the water and put the dish back on top of the vase. The bulb resides in the dish throughout the entire growth cycle. An added plus for when you are not using the vase to force bulbs is that it becomes a receptacle to keep long stemmed flowers in place.