Outdoor wedding flowers need a water source - otherwise they will wilt quickly in the outdoor air. Spray bars are a long brick of Max-Life Florist foam with a styrofoam base, all wrapped in a dark green poly film that helps slow water evaporation.
This bar is so easy I call it "soak and poke". Simply let it float soak in water that has been treated with a professional flower food. Wire to the arch and then poke the flowers in. If the flower stems are soft, give a little cut with your flower knife and push the stem in. Simple and easy!
Need longer bars? Check out the raquettes which come in a variety of sizes. They are the same as the spray bars, just a longer length.