The phrase "a growing hub" is correct and usable in written English.
It can be used to describe a place or center that is increasingly becoming important or popular for a particular activity or industry.
Example: "The city has emerged as a growing hub for technology startups, attracting entrepreneurs from around the world."
Alternatives: "an expanding center" or "a developing focal point".
In addition, large amounts of cash, he said, pass easily through Panama City's international airport — itself a growing hub for flights to and from all over Latin America — because of loose and unenforced customs reporting requirements.
Laos is becoming a growing hub for the trade in endangered species with foreign tourists, particularly from neighbouring China, driving the demand for illegal products, according to environmental groups.
Penang, which traditionally draws tourists to its beaches and the colonial elegance of its capital, Georgetown, topped the state investment league in Malaysia for the first time in 2010, and did it again in 2011, bolstering its position as a growing hub for high-technology manufacturers like Intel and Honeywell.
Along with all of these, let's not forget Amazon Prime, a growing hub for repeats and original programming; Apple TV, where viewers pay to download individual shows; and Dish's Sling TV, where viewers can watch live television channels (including ESPN, which is key) and other on-demand content over the internet for only $20 a month.
And it is a growing hub for the IT and pharmaceutical sectors thanks to state of the art research and development facilities at some of Montpellier's universities.
This airport is a growing hub for travel and business in Northeast Ohio, and there is strong bipartisan support to ensure the safety of travelers and airport employees".
That was the first year of a still growing hub of theater activity, from staged public readings to private training institutes (even for critics).
"But it's a lot of fun to be building in a small rapidly growing hub.
It encouraged flagship restaurants, and it worked well with the growing hub system, which required transfers.
Hulu, the rapidly growing hub for online television and movies, aims to go public through an offering that could value the company at more than $2 billion, according to people briefed on the matter.
As the most populous city in the region, it's no surprise that Chicago is the fastest growing hub in "Silicorn Alley" in the development of its investment ecosystem.
