The flowers for the main altar are usually grand and elaborate as they not only serve the purpose of decorating but also direct the visual attention of the guests- toward the front of the church or ceremony venue and to the bridal couple. They should be high enough to be seen from the back.
If your ceremony is not in a place of worship, you can decorate an arch, gazebo, or any other suitable structures to act as the altar with flowers or greenery. In the Hindu religion, the ceremony, takes place in a Mandap, which is a canopy, placed at the altar and covered with greens and fresh flowers.
Things To Consider: When choosing floral accents and decorations for main altar, consider the size and style of the building, the style of the wedding, the cost, and the regulations of the particular site. Some ceremony sites like churches are built with such architectural splendour that is ornate enough and you don’t need to too much or extra flowers. In some cases you may just need to add a few dramatic showpieces that will complement the existing décor.