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Yes, dahlias bloom in AugustYes, dahlias bloom in August and it's a perfect flower for special events. You can contact a cut your own farm like this one in Portland, OR. http://www.krugersfarmmarket.com/flowers.html or check out other gardens that sell flowers in bulk for special occations. http://www.lemeragardens.com/ is one example. You can also ask your friends and family to plant dahlia tubers in the spring and then cut the blooms for your wedding in August. Good luck!  

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