Cooks was a large concern with a factory in Dolphin Road that once backed on to fields in Kingston, now completely built over, where much of the fruit for its jams was grown. Apart from hand drawn advertisements the only photo I’ve seen of their products is this detail from a larger image showing jars of their raspberry and strawberry jams.
These photos give some idea of the extent of the fruit nurseries above the factory and those on the right confirm what you say Lihpsir. Top right shows what are probably fruit bushes being grown between the Old Shoreham Road and Connaught Avenue. With Buckingham Park in the distance the photo below right shows similar vegetation all the way up to Southlands and the Upper Shoreham Road.