I don't know the answer to this either, but I want to know...
I found a book that I am going to order:
Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long
The author lives in Maine? up north anyhow, and he gets vegetables all year, if he can, I know that I can!
But, he doesn't have the huge push in summer, because he has them all the time...
Wouldn't it be nice to have more leisure time in summer and still eat fresh, wholesome foods all year.
That does it, I am going to Amazon and get that book on the way to me!
Talk to your plants.... If your plants talk to you... Run!