Romaine LETTUCE on the deck. Leaf lettuces grow very quickly and in little space. If you succession plant, sowing seeds every week in a few different planters, you'll create a supply of greens that will be ready in a steady stream all summer. Greens like these are also good for sheltered decks or patios that don't get much sun, since lettuce doesn't like a lot of heat and will grow better during the summer in cool shade
hanging planter / room 4" PVC pipe (black or white), cut to whatever size you like, glue on end caps, spray paint with your choice of color (Krylon for plastics), be creative with what to use for hanging - copper tubing could be really fun... hemp cording... chain links...
You really can grow veggies in a pot!
Turn Storage Containers into Self Watering Tomato Planters. This is actually brilliant. If you click way down on the link, you will find a link to another website that has a detail video. This method allows above ground growth, with exact water needs, and for late growth regions it accelerates growing season