Fall is officially here and soon, we’ll all see pumpkins in the stores and on our neighbor’s porches. But look over the back fence and you might be surprised at the size of the pumpkins they’re growing in the backyard next door. We’ll spend this hour with Susan Warren, deputy bureau chief for the Wall Street Journal in Dallas and author of “Backyard Giants: The Passionate, Heartbreaking, and Glorious Quest to Grow the Biggest Pumpkin Ever” (Bloomsbury, 2007). Warren’s largest pumpkin to date weighed 240 pounds.