Rooibos manufacture type: Fermentation turns the leaves from green to deep red and gives a slightly sweet note
Yerba mate manufacture type: Mate leaves are processed somewhat like tealeaves. The tips of the branches are cut just before the leaves reach full growth and the leaves are steamed and dried (in fired mate the leaves are dried over fires) The dried leaves are sifted and allowed to age in order to enhance the flavor of the mate. The caffeine content of mate is comparable to that of mild arabica coffee
Green tea manufacture type: The process for making green tea is the shortest. Withering is done first, but this step might be omitted. Rolling the leaves to break the membranes for oxidation is skipped, hence the oxidation process is also skipped. After withering, the leaves are pan fried or fired to prevent oxidation from occurring. The last step is to roll the leaves and dry them one last time for its final shape. The green tea leaves usually remain green.