Did some Googling and found some stuff for ya:
"
How to Buy Fresh Vegetables" prepared by the USDA Agricultural Marketing Service. Shows you what to look for in a variety of produce.
I found the following table on a tripod site and I wanted to spare you all the popups...
Quote:
Some vegetables will keep for months, while others are good for only a couple of days. The storage times listed below are for vegetables that are kept in the refrigerator.
Asparagus; 1 or 2 days
Lima Beans " "
String Beans 3-5 days
Beets 1-2 weeks, remove the greens
Broccoli 1 or 2 days
Brussel Sprouts " "
Cabbage 1-2 weeks
Carrots " "
Celery 3-5 days
Cauliflower " "
Corn 1-2 days (do not husk)
Cucumbers 3-5 days
Eggplant 1-2 days
Greens " "
Mushrooms " "
Okra 3-5 days
Onions Several months- room temp with air circulation
Scallions 1-2 days
Peas " "
Peppers 3-5 days
Potatoes Several months- dark, dry place with air circulation
Summer Squash 3-5 days
Winter Squash Several months-Cool, Dry Place
Sweet Potatoes Several Months-room temp.
Tomatoes Several Weeks (refrigerated, uncovered)
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Here's a good page called "
Selecting & Storing Fruits & Vegetables" by the Clemson University Extension.
That should get you started!