Cow parsley - will it last?

The Hedges around us are full of cow parsley at the moment, but we are watching it anxiously. We want to use it as part of the table decorations for our daughter's wedding on 25th of June. but if it is looking so good now will it still be in flower 0n 25th? (Don't try to find Chloe hiding in it, she is standing next to me!)