Full disclosure, owners Jimmy and Jonathan are two of my dearest friends, but they're kind of a big deal in the American Grown Flower industry and Slow Flower movement, having been featured in trade publications and at conferences.
I had my wedding at their studio/workshop/garden and it was a dream. When people see my wedding photos, the only thing they comment on is the flowers and my dog.
GreenSinner has done some of the most beautiful and innovative wedding and event design in the city. I would recommend it to anyone, confident you'll get something even more amazing than you dreamed. Their flower CSA is also excellent - local flowers at a fair price with pickup spots around the city.
Another business with roots at Pittsburgh Public Market that is now contributing to the revitalization of our city!