Don't keep potatoes and onions side-by-side. Both give off a different gas that shortens each other's storage life. Keep them in plastic bins in seperate corners of your kitchen.

Both need cool dark places.Always leave any produce packed in a mesh bag in the same mesh bag. Examples are garlic, onions, grapefruit and potatoes.

Lemons are sensitive to too much cold and should be kept dry and away from anything that gives off a strong odor as they will absorb it. Keep them away from ethylene producing produce as well.

Other ways to preserve your fruits and vegetables longer is by canning or freezing them. The Internet is full of ideas on both of these methods. A friend who grows his own vegetables likes to place his carrots right side up in a big bucket of sand in his own cold room . He swears this keeps them crispy and fresh for months.