Given the quality and popularity of the Clos des Papillons, the Carignan blanc from Mas Gabriel, I am intrigued as to why this variety is virtually unheard of and seemingly rare. After all, red relation Carignan is arguably the defining contributory grape to the identity of the region's red wine. Having picked it for a couple of days I now appreciate that, like the noir, yields need to be low and that even in the best years a labour intensive thorough triage of the bunches is essential for a quality wine. It basically isn't economically viable and can only really exist as a second fiddle for an independent producer.
I came across this site Observatoire viticole of the Hérault maintained by the Conseil General de l'Hérault. Its packed full of data and statistics on all matters relating to the grape in the department. Finding stuff is a bit clunky, much of the content is just documents, the search facility works well at a high level when one gets the hang of it.
In 2009, the most recent data, Carignan blanc is reported to occupy 230 hectares. Maybe this sounds a fair amount, but it represents just 0.25% of the Hérault's surface area under vines. Much of it will end up as the minor component of a blend, but if there's any good news it should all be good quality low yielding old vines. By comparison, in 2004 there were 392 hectares representing 0.36%. At this rate it will be very rare indeed by the end of the decade.