Walter Knoll: Fall Wedding Flower Trends Posted 11:37 am, September 19, 2012, by John Pertzborn FacebookTwitterRedditPinterestLinkedInEmail (KTVI) – If you’re getting married, you’re gonna need flowers! So what’s the average cost for wedding flowers these days? Scott Hepper can answer that. He’s the master designer at Walter Knoll. He talks about fall wedding flower trends and how much they could cost you.