I thought I heard that artichokes like what is basically a Mediterranean climate, but with cool, misty nights. They grow in some parts of California- I thought it was Castroville- and thrive there. I dont' know if your part of North America will support them without special techniques. Try this link:
http://www.orst.edu/Dept/NWREC/artichgl.html I typed in "artichoke cultivation" in Google.com , and got this and many other hits. Good luck! I love mine with lemon and butter- lots of it. Mmmmmmm....