Why does changing the water in a vase extend the life of cut flowers?

Question

I don’t understand why flowers last longer if you change the water every day but fall apart if they are left in a full vase of water from yesterday. Are they removing nutrients from the water?

In: 146

Answer 1

One thing I do know is that the cut ends of the stems degrade and can’t pull up the water after a while. If you recut the ends when you change the water the flowers last a lot longer.