The use of grow as a transitive verb with objects other than plants and beards goes back to the 16th century. It had long fallen into disuse, but was revived in the early 1990s, when during his US presidential campaign Bill Clinton promised to “grow the economy”. Now commonly used in commercial jargon with objects such as ‘business’, ‘organisation’ etc, it is nicely chosen for this advertising space, one of a number where local businesses sponsor floral displays around the city. The sceond photograph shows how widespread this use of the verb has become.
Outside Norwich Railway Station & Guildhall Hill, Norwich, Norfolk, UK