How do I preserve cut bullrushes?

bullrushes (typha sp.) explode and release their seeds. I want to use these bullrushes in a flower arrangement and need to know how to prevent them from releasing seed.

How do I preserve cut bullrushes?
They actually preserve themselves. Cut them and let them dry

naturally in a vase. After they are dry I spray them with hairspray

so far it has worked fine. But use cheap hairspray.
Reply:I spray them with a good dose of hairspray.

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beauty