I believe there are ways to get flowers you like whenever you want them, especially if you plan in advance, but this can also be a good guide for choosing flowers for your wedding day.

Flowers from Christy and George

spring
lily of the valley, lilacs, tulips, iris, hyacinths, camellia, daffodil, forget me not, gardenia, jasmine, pansy, peonies, broom, freesias, foxglove, rose

summer
roses, dahlias, delphiniums, lockspur, flocks, snapdragons, bougainvillea, fuchsia, honeysuckle, ox eye daisy, peony, sunflower, wax flower, freesias, gardenia, lilies, bouvardis, hydrangeas

fall
chrysanthemums, gladioli, hypernicum berries, cotoneaster, red/orange lilies, calla lilies, bouvardis, crabapple, eucalyptus, heather, hydrangea, ivy, sunflower, dahlias, beauty bush, amaryllis, orchid

winter
roses, orchids, poinsettias, amaryllis, arum, calla lily, crocus, holly, hyancith, ivy, snowdrop, tulip, violet, lilies, anemone, african violet, jasmine