The pedicel of the water lily cut flower bent after I bought it for two days. What happened?

I have never heard that putting cut flowers in hydroponics will feel a bit like putting them in salt water, which will cause plants to lose water. Let's put them in clean water. I bought fresh chrysanthemums for more than half a month before, and the buds can bloom. Without any hydroponics, without roots, plants have no siphon pressure. It is estimated that they will only lose water and will not absorb water. Let's try to put them in clean water. It is suggested that all flowers be soaked in clear water for emergency treatment (that is, flowers float on the water and others enter the water). I forgot about this for an hour, and then I can arrange flowers normally. If you want to keep fresh, you can drop a drop of detergent in the water, then put the pedicel in the water every one or two days and cut the soaked pedicel obliquely. According to my experience, I usually have to cut one or two centimeters a day, so I can change it frequently.