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Harvesting and Storing Home Garden 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:

1.  Cool and dry (50-60°F and 60% relative humidity)
2.  Cold and dry (32-40°F and 65% relative humidity)
3.  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 it is clean and not contaminated with pesticides.

Specific harvest and storage information for some commonly-grown vegetables is below. Expected shelf-life times are only estimates.

Vegetable

When to Harvest

How to Store

Expected Shelf-life

Comments

Asparagus 3rd year after planting when spears are 6-9 inches long Cold and moist 2 weeks Keep upright
Basil When leaves are still tender At room temperature 5 days Keep stems in water; will discolor if kept in refrigerator for 10 days
Beans, snap About 2-3 weeks after bloom when seeds still immature Cold and moist 1 week Develop pitting if stored below 40°
Beets When 1.25-3 inches in diameter Cold and moist 5 months Store without tops
Broccoli While flower buds still tight and green Cold and moist 2 weeks  
Brussel sprouts When head’s 1 inch in diameter Cold and moist 1 month  
Cabbage When head is compact and firm Cold and moist 5 months  
Carrots When tops 1 inch in diameter Cold and moist 8 months Store without tops
Cauliflower While head is still white, before curds “ricey” Cold and moist 3 weeks  
Corn, sweet When silks dry and brown, kernels should be milky when cut with a thumbnail Cold and moist 5 days  
Cucumbers For slicing, when 6 inches long Cool spot in kitchen 55°F in perforated plastic bags; storage in refrigerator for a few days okay 1 week Develops pitting and water-soaked areas if chilled below 40°F; do not store with apples or tomatoes
Eggplant Before color dulls Like cucumbers 1 week Develops pitting, bronzing, pulp browning if stored for long period below 50°F
Kohlrabi When 2-3 inches in diameter Cold and moist 2 months Store without tops
Lettuce While leaves are tender Cold and moist 1 week  
Muskmelons (cantaloupe) When fruits slip off vine easily, while netting even, fruit firm Cold and moist 1 week Develops pitting surface decay with slight freezing
Onions When necks are tight, scales dry Cold and dry 4 months Cure at room temperature 2-4 weeks before storage, don’t freeze
Parsnips When roots reach desired size, possibly after light frost Cold and moist 4 months Do not wax or allow roots to freeze; sweetens after 2 weeks at 32°F
Peas When pods are still tender Cold and moist 1 week  
Peppers When fruits reach desired size or color Like cucumbers 2 weeks Develops pitting below 45°F
Potatoes When vine dies back Cold and moist; keep away from light 6 months Cure at 50-60°F or 14 days before storage, will sweeten below 38°F
Pumpkins When shells harden, before frost Cool and dry 2 months Very sensitive to temperatures below 45°F
Radishes When roots up to 1.25 inches in diameter Cold and moist 1 month Store without tops
Rutabagas When roots reach desired size Cold and moist 4 months Do not wax
Spinach While leaves are still tender Cold and moist 10 days  
Squash, summer When fruit are 4-6 inches long Like cucumbers 1 week Do not store in refrigerator for more than 4 days
Squash, winter When shells harden, before frost Cool and dry 2-6 months, depending on variety Curing unnecessary; do not cure Table Queen
Tomatoes, red When color uniformly pink or red Like cucumbers 5 days Loses color, firmness and flavor if stored below 40°F; do not refrigerate!
Turnips When roots reach desired size, possibly after light frost Cold and moist 4 months Can be waxed
Watermelons When underside turns yellow or produces dull sound when slapped Like cucumbers 2 weeks Will decay if stored below 50°F for more than a few days

Source: Cindy Tong, Extension post-harvest horticulturist

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