Think you can't grow things because you have just a patio or deck?
How about potato's or sweet potato's? Yep you can, and this is how.
Then fill with potting soil. Easy peesy. If you use the black plastic, poke some holes along each side with a pen or chopstick.
Now go out and buy potatoes..... you don't need the garden center ones, all you need is a bag from the grocery store... they will grow just as good as the fancy ones you buy at the garden center. The older he better, you want they to have sprouts coming out of them.... if no sprouts, wait till they start sprouting before you plant them.
Place the potatoes so that they are partially on top of the soil. Make sure the sprouts are down. Potatoes grow on the roots of the plant.... so one potato will give you a dozen or more!!! (this picture shows them just around the edges of the planter, but make sure you fill the whole top for more potatoes!!!
Water well, and wait, you will get some beautiful green growth and leaves.
In September, just dig around and collect your bounty.
You can actually start digging around by July if you plant them in May or June, they won't be big, but still very usable!