I have been urban gardening for the last 9 months and enjoying it.  I also followed last winter the local CSA farm's newsletter.  This year I plan to join and have been saving each month because it is expensive ($600) but I can also break it down in payments.  But it is organic and has a long season here in Florida (Oct. thru May).  I kept some of my canning jars from when I used to be able to can.  I will freeze and can the excess that I get. They offer heirloom veggies and fruits too.  I bought several pineapples this spring to get the tops to plant.  I made pineapple jam out of some and it tastes so good.  I am thinking of making another batch because I have priced it. Making is cheaper.  The author of this article hasn't got a clue about what he is talking about.  I drove truck and can tell you much of it is picked green and ripens in route. I had to make sure to not let them load me to the max weight because the fruit would put on weight as it ripened.  Pineapple is bad for that. Oh and he forgot how expensive it is for fuel to run the refrigeration on the wagon or train car.  My little strip of a garden has been a joy of yummy food.  I had forgotten how good a cucumber tasted from the garden.  The ones we get now at the grocery is bland and tasteless.  I am working on a vertical garden because of space.  I bought 2 heirloom tomatoes and have taken cuttings off of them (black Russian and orange strippy) and getting a second crop from the cuttings.  I have a cherry tomato that has been producing all winter and must be a perennial because it has new growth from the roots.  I am ready to put in hot summer veggies.  You have to pick what grows in your area and fits your space.  I am to the point now where it has become very cheap for me to do this.  I use very little chemicals and have been sticking with heirloom seeds.  Also pick veggies that are hard to find in market or expensive to buy.  There is a lot you can grow in containers too.  I live in an impoverished area and urban gardening is being encourage.  You can't grow everything but there is plenty that you can.   

As a boondoggly public-private partnerships that uses more volunteers than paid staff, the Brooklyn Grange makes more sense than the Georgia Aquarium which occupies 13 acres of prime real estate and is filled with a whole lot of salt water and a bunch exotic non-edible sea creatures, some of which would actually eat people if they could catch them.