Kind of a pricey but very nice flower/plant shop. High quality plants that you know are going to be in good shape. Bought many ivy plants here that lasted the whole season outdoors, as well as miniature spruces for winter window boxes, and impatiens for summer.
I like the exposed brick inside, and the arches from which more plants are hanging. They do a careful wrapping job. Always seems to be crowded, which suggests that others like it too.
But when I have time and feel like saving money, I head to the Union Sq farmer's mkt on Mon, Wed, Fri, and/or Sat. The plants are 40-50% cheaper there, and of similar quality. FYI.