The specialist amenity nursery will supply a range of shrubs and herbaceous plants as part of the project, for landscape construction and maintenance company Whiting Landscape and landscape architects Macgregor Smith. The contract is worth more than £30,000.
The development will include a new 11-screen cinema, family restaurants, a new Asda supermarket and petrol filling station, and create more than 530 new jobs.
Work commenced on site in October 2015 and it is anticipated that the facilities will be open to the public this summer.
Johnson of Whixley senior amenity sales manager Tony Coles said: "It is a privilege for Johnsons to be making such a significant contribution to a project that will not only revitalise the site, but also create new jobs and opportunities for local residents.
"Johnsons has a proven track record of meeting the demands of large, high-volume projects and delivering plants to a high-quality and at an attractive rate.
"We’re proud to be working alongside Whiting Landscape on this project, and eager to see the wider project unfold in the months ahead."
Macgregor Smith director Rupert Grierson said: "Macgregor Smith has been working on the Former ARLA Dairy for a number of years, and highlighted at an early stage in the project the requirement for high quality plant material as part of delivering the client’s vision.
"We are pleased to see that the quality of the plant material and installation is now coming together well and look forward to seeing new spring growth and the opening of the development."
Whiting Landscape general manager and buyer Michael Ganner said: "We’re delighted to be working alongside Johnsons of Whixley on this exciting project, and feel certain that they will deliver to their usual high standards.
"This is an exciting project for all parties, who each share a commitment to quality and value, so Johnsons were a natural fit for this contract."
Johnsons has grown plants for a range of high-profile schemes including the Forth Road Bridge, Royal Parks, HS1 and the Athletes Village at the Glasgow Commonwealth Games 2014.
At the end of last year it supplied GB Landscapes with 13,000 shrubs, 14,500 herbaceous and grasses, 4,300 rhododendron and azalea, 1,300 roses, hedging and 130 trees in a £138,000 contract for Brooke Park in Derry/Londonderry's £5 million HLF-funded regeneration.