"What is "musty" or "earthy" flavour?"
What came to mind when I read the title of this thread is William P. Solomon's Presbyterian Mixture. In my review of this Mixture on TobaccoReviews.com I stated:
"To paraphrase "The Most Interesting Man in the World" who appears occasionally in television commercials for a certain brand of beer, "I don't often smoke English blends, but when I do I prefer Presbyterian Mixture!" To me, it epitomizes the phrase "classic English pipe-tobacco."
The aroma in the tin is delicious: wet leathery, smokey, late fall-woods musty sweet, and cow-barn-like ripe. It's one that, if it could be transubstantiated, I would happily chew on for hours in the same manner that my dog worries her favorite marrow bone.
Presbyterian Mixture's appearance is pleasing, too. Remove the cardboard cover beneath the lid, peel back the clear plastic inner wrap, and you will find substantial strands together with ponderous pieces of light-to-dark brown Virginia leaf, intermixed with Latakia tips that are almost black. It's typically moist, not overly so, but does benefit from some drying prior to use. This is a hefty-looking amalgam that promises solid smoking pleasure.
It does not disappoint. Using the Frank method to fill the bowl of a favorite Savinelli Oscar, it provides me with a good hour of English ecstasy. I find that this tobacco is at its best when smoked SLOWLY, but then aren't they all? I don't mean that you should sip it. Rather, take a deep draught every minute or two and let it drizzle out of your mouth. Take your time as you contemplate its manifold charms and it will reward you. Become distracted (or simply give in to gluttony) and puff too fast, and it will both bite and kick. Nicotine is here in abundance, but will behave if you treat this mixture with gentleness and respect.
Without drying I typically need only two pipe-cleaners per bowl; with drying only one. This tobacco reduces to a fine grey-white ash with little dottle. The room note is comforting in the same manor (pun intended) as that of an old, familiar, and favorite hunting lodge, cabin, or library.
This is a fine English tobacco mixture, and I give it my highest benediction. Amen."
The presence (or not) of Latakia in this Mixture is a subject of debate. Some claim that it has it, others claim there is none. I fall into the former camp. In any event, it is certainly NOT a "Latakia bomb" by any odds.
I hope that you find this to be useful.