Carole,
I searched for Goji Berry and here you are with the information I need :o)
Matthew,
Good info.
Twitcher,
I'm also zone 5. Invasive how? By seedlings, runners?
I bought some of the dried fruit and was not impressed with the taste. I also wondered if they were from China and they were very expensive. I'd grow them for the health aspects tho.
Hmm, maybe it's better to read about them than plant them, lol!