Representative Darren Sanders said: "About a year ago we put up signs to gauge people's interest. We wanted to see if it was something that would work before we went ahead and bought the land. As it turns out, people have been really interested. The waiting list to keep caravans there has 100 names on it and we have customers asking about it every week.
"Once it's up and running it should make quite a bit of money year on year - a continuous income."
He added: "We're hoping to franchise it out and get somebody else to run it."
The centre is applying for planning permission to put up another new building that will extend the garden centre by about a third. The space will be used to bring the restaurant inside the main centre, as well as expanding the home goods areas.
It has not yet been finalised as to who is doing the building work. "We're hoping it will be completed by September, ready for Christmas," said Sanders.
Garden King is also launching a new website in the next few weeks and is looking to expand its online sales. The centre intends to put a lot more products online to sell and will invest money in getting traffic to the site.
The news about the new developments at Garden King Newhall comes as it closes the branch in Bradley. Sanders said: "Planters' other two centres have been getting lots of work done, with Newhall getting left behind. We decided now was the time to invest in it."