posted 3 years ago
When making hot tea, the water temps can kill the bulk of the bacteria, so fresh leaves are no big deal.
With sun tea, using fresh leaves can be a bit of a risk, since bacteria on the plant's surface can quickly populate the warm water.
So, you may want to do something to thoroughly clean the leaves, first. Soap and water, or a scrub with lemon juice & salt, or a soak in vinegar followed by thorough rinsing in clean water.
Then muddling the leaves & using in tea. Adding citrus juice into the water may also help bump the acidity to reduce bacterial growth.
o_o I have had more than one sun tea jar get cloudy & slimy from improperly washed leaves and forgetting to drink it fast enough, so tbh I tend to do cold-steeped or 'instant' tea instead.
I prefer to crush fresh mint leaves thoroughly in the mortar along with a little sugar, rinse it into a glass, and drink it like that - make it per-glass, or just enough for a couple glasses I'll drink that day, instead of making a bunch that I'll drink later.
Regarding mullein in particular, I don't think there's anything to worry about with the leaves?
Don't eat the seeds.... but other than that, you should be fine.