Frozen vegetables can achieve preservation without significantly reducing their nutritional value or changing their natural color, while canned foods have a significant impact on both aspects. Frozen vegetables at home can last as long as commercial products if handled properly, packaged, and maintained at consistent temperatures.

Storage time

If vegetables are kept at temperatures below -17 degrees Celsius, the shelf life of most varieties is between 12-18 months. Unopened commercial processed frozen vegetables have a longer shelf life than frozen at home, but it is best to eat them within a year. Freezing vegetables beyond the recommended time may lead to fiber breakdown, formation of ice crystals or frostbite, but they are still safe to consume.

Freeze dried packaged vegetables

Dried or palletized frozen vegetables can be used for packaging. Dry packaging requires blanching vegetables in bundles and packaging them in frozen safe containers. Put the cleaned vegetables in boiling water for 1-2 minutes to kill harmful bacteria, then immediately soak them in a sink or bowl filled with water and ice to stop the cooking process and fix the color. Drain in a filter or strainer. If using a freezer bag, try to squeeze out the air in the bag as much as possible before packaging.

Plate packed frozen vegetables

This method involves freezing individual vegetables in a tray or baking tray and solidifying them before packaging. This method is suitable for small vegetables such as mung beans, corn, or peas, as they tend to gather together and form crystals when packaged in a dry manner. The packaging process for frozen vegetables in plates is the same as that for dried vegetables mentioned above.

Frozen vegetable container

Whether using flexible or rigid containers to freeze vegetables, they must be moisture-proof and able to prevent food from coming into contact with air. Hard plastic or polyurethane containers can be well stacked in the freezer and are also easy to label, but it is difficult to remove air. Specially designed freezer bags are thicker than regular food bags, making it easier to remove air and moisture before packaging. Durable metal foil or frozen paper can also be used to package vegetables, but cannot provide the same protection as plastic containers or bags.