I'm a bit worried that you've got the wrong thing. I make gallons of elderflower wine and the plant you're using doesn't look like elderflower to me. Leaves look totally wrong. I don't know how to post images but this link (hopefully) shows the leaves as well as the flowers.
Elderflower cordial recipe- jonsbushcraft.com
Elderflower cordial recipe- jonsbushcraft.com
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