In this intresting article by Andrea Lange, covering the whole History of Garden & Plant Photograpy. She paints a nice picture of how Malby operated:
Garden making itself is an art form, and arguably the most successful garden photographs are those that aim only to make a record. Such are the prints by the forgotten photographer Charles Latham, who made a priceless record for Country Life of the greatest English gardens before many of them vanished forever in the First World War. About the same time, the pioneering plant photographer Reginald Malby was lugging his teak and brass half-plate camera around the Alps to record alpine plants in their natural habitat. His book With Camera and Rucksack in the Oberland and Valais appeared in 1913.