Here it is. Suppose she looked at my list and saw that apples are in season now. She decides to get some apples and bake an apple pie. She goes to the grocery store and buys some apples, some agave nectar, some cinnamon and a pie crust and goes home and makes a delicious pie. She invites some friends over, serves the pie and proudly tells them that they are eating a pie made with seasonal fruit. Well what she didn't know was that the apples she used were much more likely to have been grown in Washington, or New York or New Zealand than Georgia. Some stores are now labeling their produce with the location in which it was grown but you still have to make the connection between local and seasonal.
I think that most people use "seasonal" as a synonym for "local" but as we saw in the example above that may not be the case. I think that the term "seasonal" has become part of the lexicon mainly through "foodie culture" (i hate that word by the way). It sounds cooler to say "seasonal" and is used as a marketing tool by chefs and restaurants. Any vegetable or fruit that is available is in season wherever it was grown. The issue is the amount of energy required to transport the food over long distances. On average food travels 1500 miles from the place it is grown to the place where it is consumed. So, i have concluded that the term seasonal is irrelevant and muddies the water for those who are not immersed in food culture. We need to be sure our words clearly convey the meaning we intend them to.
Local = seasonal but seasonal does not always equal local.