If you do an organic search now for Denver flowers you can see the issue that the writer is having:
Mike has, I believe, coined the term "authoritative onebox", wherein a single business shows up in a maps onebox within an organic search.
I suspect he coined the phrase from google patent writings by
Bill Slawski here and in other writings
My impression is that it appears the business with the authoritative onebox results has done a great job of mastering some of the qualities and characteristics of Google Maps rankings.
(my computer is soooooo slow today Its taking forever to upload a screenshot image of the search results--you'll have to see them yourself)