A recurring feature of the flag debate, most recently expressed by Mike Hosking, is the sense that the fern is the appropriate symbol to 'really say New Zealand'.
This may be so, but if we are to have the mature debate on the flag that Hosking is asking for, we need to be aware that our present response to fern symbolism springs from the depths of our colonial past.
Few people today have heard of Pteridomania, the fern craze, but our Victorian forebears had it badly. In her 2012 book Fern Fever, Sarah Whittingham shows how it started when a Dr Ward invented a sealed glass container that recycled a plant's condensation, and allowed specimens to be protected through long sea voyages. By the 1830's it was possible to bring ferns to Britain from all around the world, and an 1837 book called An Analysis of the British Ferns and their Allies triggered widespread popular interest.
Pteridomania coincided with the heyday of the Victorian 'language of flowers' in which ferns symbolise 'fascination'. Having such a romantic association certainly helped fan fascination for ferns. By the 1850s it had developed into fully-blown middle-class collecting craze - one that would last for over forty years.
During it, Scotland and Wales had their stocks of rare ferns depleted, people died trying to reach specimens on cliff faces, and a number of places vied for the title of 'land of ferns'. But it was New Zealand that made the title its own.