Well, believe me the only reason is because I got married in October (way way out of peony season, booo). Staying in season is key for keeping your floral budget low, but staying in season doesn't mean you can't get something really close to what you want. For example a popular peony look a like is the garden rose. Although, not an exact match it will give you the same open pillowy like flower. Want to know what's in season when you are planning your wedding, here is a list of popular blooms for each season (via the flower expert). Keep in mind that many popular flowers like roses and lillies are available year round in the U.S.
Anemone, Cherry Blossom, Dahlia, Freesia, Gardenia, Lilac, Peony, Poppy, & Tulips
(Image credit In the Now via Elizabeth Anne Designs)
Amaranthus Baby's Breath , Calla lily,Carnation, Chrysanthemum, Cosmos, Dahlia, Delphinium, Freesia, Gardenia, Hydrangea, Iris, Lilac, Casa Blanca Lily, Gloriosa Lily, & Star Gazer.
image credit (l-r) & unlimited via style me pretty, a thyme to cook via style me pretty
Anemone, Baby's Breath, Carnation, Chrysanthemum, Cosmos, Echinops, Freesia, Gerbera Daisy, Gladiolus, Hypericum, & Iris.
image credits (l-r) Martha Stewart Weddings, Summer 2003 & Real Simple via Elizabeth Anne Designs
Amaryllis, Carnation, Chrysanthemums, Evergreens, Gerbera Daisy, Holly berry, Lily, Asiatic Lily, Casa Blanca Lily, Orchid, Pansy, Queen Ann's Lace, Roses, & Star of Bethlehem.
image credits carolyn rohem via intimate weddings
Also, adding fruits can really bump yup the wow factor for centerpieces adding texture and depth!