For those who are interested in making herb teas, there are some herbs which taste better/work better if they are fermented. Among these are blackberry and raspberry teas.
How to Ferment Herbs
Pick the herbs and then wash them. Let them dry until they are about half-dry i.e. not 'crisp'. Take a linen tea-towel and wet it a LITTLE. Roll the herbs up in the towel and let them dry for 3-5 days. Repeat the process in the linen tea-towel 3 to five times and voila - fermented herb tea.