 From 1935 he contributed a weekly column to the Cairns Post on behalf of the Naturalist Club, in which he publicly advocated the establishment of a botanic garden at the recreation reserve.In 1933, with encouragement from the Queensland Government Botanist, Cyril White, Flecker established the North Queensland Naturalists' Club Herbarium in the grounds of the council's nursery in the recreation reserve.The club's collection grew from around 1,600 specimens in 1937 to about 5,000 in 1950 and an estimated final collection size of around 10,680 specimens.