Use Flowers to Direct Attention to the Couple.  The primary purpose of flowers during the ceremony is to direct visual attention towards the front of the site where the couple is standing.  Spread your focus to the area where the bride and groom will be standing rather than going overboard decorating the entire ceremony site.

Check for Decorating Restrictions Before choosing any flowers for decorating the ceremony. Check with the church or ceremony site to find out if there are any restrictions or regulations on flowers and other decorations.  Many churches will not allow open flames anywhere except at the altar.  

Before you Choose a Florist, make sure that she is familiar with the ceremony site.  If she is not, have her visit the site prior to your signing a contract.

Basic Ceremony Décor.  Basically you need some flowers near the altar and possibly on the ends of the pews. For more elaborate and formal weddings, you may drape flowers and ribbons down the aisle to mark the pews and add color.

A Candlelight Ceremony.  If you are having a candlelight ceremony, you shouldn't have too many flowers. All you really need is some greenery such as ivy draped over the candelabras and possibly some white satin bows decorating the pews.