Posted: 24/07/2014 at 06:41
Lots of questions here first.
New York can be very hot in summer. Are you exposed to many animals,deer etc.? Why do you need to fence it?
What is the soil under the decking like.? Can you not plant straight into the soil.? Fences will shade what is a very small area. You may have room for a few tomatoes and eggplant bushes ,but not much else. You will need to remove the decking,I think it will just cause problems. Or you could grow in large pots stood on the decking, but you will need to spend more time watering pots than if you grow into the soil. In such a small space I wouldn't bother with onions. A courgette(zucchini) plant would take up a quarter of that space and be a better option.