OK, here's Jeremy Reeves' full reply, which I found to be really interesting.
"...As for the USA components that we use, they are: Red VIrginia, White Burley, Dark Burley and Dark Fired Kentucky. Black Cavendish and Perique are swing tobacco in this category. We use one Cavendish that is made in the USA and the leaf is grown in KY, and another Cavendish that we use is from the Dominican Republic and is made from cigar leaf. A portion of Perique is grown in St. James Parish, LA. However there has not been enough of that leaf grown in St. James to meet demand for decades. As far back as the 1900's, Perique manufacturers in Louisiana were commonly sourcing a portion of the tobacco that was needed to produce Perique, from either Kentucky, Tennessee or Canada. This is still the case, though Mark Ryan has been more open about this practice than previous Perique manufacturers have been. So all of our Perique features a portion of leaf from Louisiana, but Poche blends each barrel. So a portion of each barrel is from Louisiana and a portion is from either KY, TN or Canada. That all depends on where Mark can find the style of leaf he needs when he needs it.
Currently, all the Latakia in the world is processed in Cypress and the tobacco itself is sometimes grown in Cypress, sometimes in Lebanon. Our cigar leaf comes from Dominican Republic, and from Italy.
Kasturi is grown in Indonesia, Orientals crops of Izmir, Basma and Katerini are from Turkey and from Greece and Bright Virginia comes from Ontario, Canada. This last one may sound odd, but actually, Canada produces some of the best bright leaf in the world.
Autumn Evening, Interlude, Burley Flake #1, Burley Flake #2, Burley Flake #3, Crooner, Five O'Clock Shadow, Kajun Kake, Old Joe Krantz, and Carolina Red Flake are all USA leaf, if you consider Perique a US product, regardless of leaf origin."