My personal choice for Autumn wedding flowers would be Chrysanthemums, Zinnias and, of course, Roses. Pretty, colorful and simple, all these choices are available in an array of Fall colors and are readily available. Chrysanthemums and Zinnias, in particlar, are seasonal Fall blooms. Roses are always an elegant wedding option.
One charming flower that comes in beautiful fall colors is the chrysanthemum. Mums are available in yellow, rust, golden, and red, all the shades of autumn, as well as pastels and white. They come in many forms too, from casual to formal, from dense pincushion to lacy spider.
It is always advisable to choose flowers for the wedding according to the season, along with your personal choice. I would choose a variety of purple Iris's, white Carnations and Yellow Narcissus. as far as greenery i also would throw in some ivy and some Blue Spruce
My wedding was held outside, on a street corner, at the end of September. I was concerned about what flowers would be available. We used roses, orchids and daisies as decoration. I carried chrysantheums, a couple of zinnia and some fuchsia in my bouquet. It was sweet.
Fall wedding flowers should be simple and vibrant. Often brides of fall weddings will carry bright roses, carnations or lillys. Something that is in the color of fall and can bring out the reason you wanted a fall wedding.