You don't have to provide flowers at all, but you'll probably want to!
You can do it yourself or use a professional florist.
I'll put you touch with the right person in your particular church who can advise you on what works best.
But please note: You may wish to take some of your flowers on to your reception venue. We do ask, however, that a pedestal of flowers is left in church for the Sunday service.
Sometimes there are two weddings following each other, either on the same day or two consecutive days. In these cases we ask that the main pedestal is shared by both weddings and left in church afterwards.