How to grow 100 pounds of potatoes in 4 square feet

I always look for ways to improve my gardening efficiency as I don’t have a big yard. I grew potatoes in the last two years. They are really yummy. And it is easy and fun to grow them. The problem is that it takes a lot of space to grow them. Not anymore after I found this approach. You can literally grow 100+ pounds of potatoes in a 2×2 feet space. Excellent idea.
Materials,

• 2×6″ boards of 8 ft long… 6 pieces
• 2×2″ board of 12 ft long… 1 piece
• 2 and 1/2″ wood screws… 96 pieces

Tools

• Screw drivers
• Saw (optional, you may get your boards cut at the store where you buy them)

Detail instructions:

You plant in one bottom layer, boarding up the sides of each layer and adding dirt as you go higher (you wait until the plants have grown a bit before adding a new layer). While new potatoes are growing in the top layers, remove the boards from the first layer at the bottom to carefully dig out any that are ready for harvesting. Fill the dirt back in and board up the box again. You move up the layers and harvest as they are ready. I imagine the new potatoes in the first couple bottom layers would be somewhat awkward to get at but as you move higher–not so bad.I traced the information provided in the article to Irish Eyes Garden Seeds, they also advise you can skip the box and try growing them in a barrel or wire cage instead.
In another article on The Seattle Times (found here)