I'm going to show you an old trick for chrysanthemums. They have a tougher stem than is rather hollow.
You can use your discarded stems to create a mock "hand-tied" . look if you want to conceal the handle of your bouquet holder.
There are also times you need that flower to just be a "little bit longer". Different varieties of chrystanthemums sometimes have very short laterals.
Take a discarded chrysanthemum stem and strip all the leaves off and clean off the bumpy places where the flowers were cut off. Cut your attached stem off at an angle with a sharp knife.
Carefully slid the angled stem down INTO the hollow stem of the cleaned stem.
You now have a longer flower stem that can be inserted upward into the foam and it will draw water down and feed that flower head!
The lengthened stem I just created is the lowest one showing on the cascade below.
This is just a good trick to remember if you just HAVE to have one more longer bloom at the bottom of your cascade!