[1] The Dunington-Grubbs hired Sven Herman Stensson to run the nursery after he responded to an advertisement in an English paper.

[3] The first seasonal garden centers were opened in the early 1920s near the Yonge and Bloor intersection in what is now downtown Toronto and on Southdown Road in Mississauga.

In the 1940s, Sheridan Nurseries was one of many Ontario employers who used Japanese labourers interned in camps after being forcibly relocated from British Columbia during the Second World War:[6]Sheridan Nurseries hired 22 Japanese internees in 1943 and their business records show the men were not slave labour, but paid employees.

[6]Starting in the late 1960s the Sheridan Nurseries began developing hardy alternatives to the English box for hedging.

[7] Sheridan Nurseries also developed Mountbatten Juniper and Ivory Silk Japanese Tree Lilac.

It was suffering from difficulty finding workers for the farms, where conditions in the Ontario summer can be extremely hot and humid.