FILE PHOTO: A farmworker mixes piles of raw Rooibos tea

FILE PHOTO: A farmworker mixes piles of raw Rooibos tea as it emerges from a thresher at..

FILE PHOTO: A farmworker mixes piles of raw Rooibos tea as it emerges from a thresher at a processing plant in the remote mountains of the Cedarberg region, about 300km (186 miles) north of [Cape Town], March 30, 2006./File Photo