Bloom Time

Pay attention to the season -- and what's available in flower markets -- before deciding on centerpieces. By letting nature dictate flower selection, you'll save a bundle. In the northeast U.S., for example, you'll find tulips and flowering branches in the spring, peonies in the summer, dahlias in the fall, and anemones and ranunculus in the winter, according to Roshy Naini, creative director of floral-design studio In Bloom New York (212-662-8852; In Bloom's Tumblr page highlights what's in stock on any given day.