To answer your question, they're growing green tea in Switzerland now
I know quite a few countries which are producing greens, but only one that makes the Japanese varieties..Korea! Tea Gschwendner for example has a Sencha from Korea which I like A LOT. If I'm correct, they're active in the US also. But I don't see that particular tea on their HP. Anyhow, teehaus.com
seems to have it to, i just don't know that vendor.
Ugh, leave it to a massive conglomerate like Tea Gschwender to take a country known for producing great green teas in their own right, with their own long standing tea traditions, and then simply market Korean Sencha.
Not to really say anything bad about Japanese Sencha, because I really enjoy sencha, but its nearly the equivalent of a large corporation acquiring a chocolate producer in Belgium (Or Switzerland, or pretty much any country known for outstanding chocolate), and setting out to make a Hershey's knock off. (Again nothing really against Hershey's either).
Sorry for this little rant, and I know in the end companies go with what they can buy and sell that will make them money, but few people know about Korean tea and its culture anyway, and to give many more the impression that its a country that just mimics other counties styles does it a great disservice.