It depends on what you're looking for:
Herbal tea? Tons. Try labrador tea, which is native to Canada and the northern United States. There are too many to list, really.
Actual tea? I'm not sure of any grown commercially in Canada, but there are a few spots in the U.S.
1) Bigelow tea runs a farm in South Carolina under the America's Classic name (http://www.charlestonteaplantation.com/
2) Hawaiian tea can be harder to find, as quantities can be somewhat limited. However, I know Samovar Tea sells black and oolong tea from Hawaii (http://shop.samovarlife.com/SearchResul ... rch=hawaii
3) Lastly, and this one I just found out about the other day, there are people growing tea in Washington state. Sakuma Bros. offers green, white, and oolong teas all grown an hour away from Seattle (http://shop.sakumabros.com/tea.aspx
I hope that helps!