Having read this thread, it's got me thinking about which method might be best......
I don't know.
What I do know, is that different herbs and/or spices, well the flavouring part/aromatics etc will alter their flavour depending on many things.
For instance, is the herb/spice, or the aromatic/flavouring part/oil/whatever one that will allow the extraction of flavour/aroma better in water or in alcohol?
Still not got me there ? Ok, l'll use chilli pepper as an example.
So you eat something, or cover it with sauce or whatever.....and your mouth starts to burn.
You reach for that glass of water or beer as it's nice and cold and take a large swig. Aaaarrrrrggggggggghhhhhhhhh! That makes it seem even worse.
But why?
Because the capsaicin in the chilli is a "fatty alkaloid", what you experienced when you took that swig of water/beer was the "oil on water" effect.
Because the capsaicin being a fatty alkaloid, you'd need to either use butter, high fat cream or alcohol/spirits to relieve the burning sensation.
The butter or cream helps dilute the capsaicin or the alcohol to dissolve it.
See what I mean? If the spice/herb is one where the flavouring/aroma element of it is one that naturally is oily/fatty then surely you won't get the depth of flavour. Whereas if it's one where the flavouring/aroma is carried in the water element, then you will get the flavour/aroma by making the infusion (sorry I won't call it a "tea", because tea is tea and not any kind of hot, water infused, herb/fruit flavoured drink.....).
So, I'm guessing that it would surely be a better idea to crush or grind the herb or spice to something like the consistency of coffee grinds and either add it to the fermenter or into the finished ferment. As the water element would/should dissolve the (water based) flavour/aroma element or the alcohol would dissolve the (oil/fat based) flavour/aroma element.
Giving the correct level/depth of flavour. Or that's what the elementary level science tells me anyway.
Plus, I'd guess that unless you have a way of calculating what strength of the flavour/aroma element any given herb/spice has, then it's got to be a little "hit or miss" as to how much you'd use......
My only other thought would be that it's better to use too little, than too much......you can add more if the taste isn't strong enough, but you can't take it out if it's too strong........Joe Mattiolli's comment about cloves in the JAO recipe being point in fact here.
I hope that doesn't confuse the issue here. I just don't recall ever seeing any list of which herbs/spices are normally "extracted" in which way.....
regards
fatbloke