Wedding Flower List
You certainly don't need all of the flowers listed here, but this list will help you get started with your planning.
Wedding Party
Bridal Bouquet
Flowers for bride's hair
Bridesmaid's bouquets (number of bridesmaids)
Different bouquet for maid of honor?
Flower girl headpiece
Flower girl basket decorations
Flower girl petals to toss
Groom's boutonniere
Groomsmen's boutonnieres (number of groomsmen)
Different boutonniere for best man?
Mother of the bride corsage
Mother of the groom corsage
Stepmother corsage
Father of the groom boutonniere
Father of the bride boutonniere
Stepfather boutonniere
Grandmothers corsages
Grandfathers boutonnieres
Other
Ceremony
Altar, huppah, or other central arrangements
Pew or chair decorations
Candles
Other
Reception
Entryway arrangements
Centerpieces for each table
number of tables
Buffet table decorations
Bar decorations
Flowers to decorate passed trays (talk to your caterer about what they'll need)
Cake decorations
Other
Wedding Flowers, corsage, boutonnieres for the wedding party, Ceremony and reception