Harvesting and storing home garden vegetables

One of the joys of summer is homegrown sweet corn, picked right outside your back door and plopped straight into a pot of boiling water or onto the grill. The advantage of having a home garden is that you can pick and savor your vegetables when they're at their optimal flavor. But how can you tell when to harvest your vegetables? How should you store zucchini if they all reach optimal size at the same time? What are the best conditions to store your homegrown vegetables? This fact sheet provides some information that will help you make decisions on harvesting and storing your vegetables.

When harvesting vegetables, be careful not to break, nick, or bruise them. The less vegetables are handled, the longer they will last in storage. Harvest only vegetables of high quality. Rotting produce cannot be stored for very long, and could spread disease to other stored vegetables.

Different vegetables need different storage conditions. Temperature and humidity are the main storage factors to consider; there are three combinations for long-term storage:

cool and dry (50-60°F and 60% relative humidity),
cold and dry (32-40°F and 65% relative humidity), and
cold and moist (32-40°F and 95% relative humidity).

For cold conditions, 32°F is the optimal temperature, but it isn't easy to attain in most homes. Expect shortened shelf-lives for your vegetables as storage conditions deviate from the optimal, as much as 25% for every 10°F increase in temperature. Some vegetables, such as cucumbers, peppers and tomatoes, require cool (55°F) and moist storage. These conditions are difficult to maintain in a typical home, so expect to keep vegetables requiring cool and moist storage conditions for only a short period of time.

Where can the different storage conditions be found in a typical home? Basements are generally cool and dry. If storing vegetables in basements, provide your vegetables with some ventilation. Harvested vegetables are not dead, but still "breathe" and require oxygen to maintain their high quality. Also, be sure they are protected from rodents.

Home refrigerators are generally cold and dry (40°F and 50-60% relative humidity). This is fine for long-term storage of garlic and onions, but not much else. Putting vegetables in perforated plastic bags in the refrigerator will provide cold and moist conditions, but only for a moderate amount of time. Unperforated plastic bags often create too humid conditions that lead to condensation and growth of mold or bacteria.

Root cellars provide cold and moist conditions. As with basements, provide ventilation and protection from rodents when storing vegetables in cellars. Materials such as straw, hay, or wood shavings can be used as an insulation. If using such insulation, make sure that it is clean and not contaminated with pesticides.