The family moved to Christchurch in 1872 and purchased the already prominent drapery business Dunstable House, renaming it J. Ballantyne and Co.
Over the next seven years, the business thrived. Deeply religious, Ballantyne ran his business with a philosophy of "honourable and upright dealings" – an ethos that gained the company an excellent reputation during what was a time of great economic prosperity in the Canterbury region.
In 1879, Ballantyne sold the business to a partnership including his son Josiah. Full ownership of the firm eventually passed to two of his sons, Josiah and William, who continued on with the strict trading philosophies of their father.
While retaining an active interest in the business, John pursued his lifelong desire to go farming, purchasing Staple Farm at Ruapuna, Canterbury.
Over the next six years he added several other major properties to Ruapuna Farm and established forestry and irrigation initiatives in the region, as well as doing a short stint in Ballantynes' London Buying Office.
In 1883, John moved to Timaru to capitalise on the increasingly affluent economy in the South Canterbury, where he purchased a drapery shop, Victoria House, which became a southern branch of Ballantynes.
When he died in 1899, The Press newspaper recorded that 50 to 60 carriages formed the procession that followed the hearse to his funeral in Upper Riccarton, Christchurch.
Today, Ballantynes employs over 300 people in its shops in Christchurch and Timaru, including some members of the Ballantyne family.