Quick Answer
Plastic bags are not a suitable option for long-term seed storage due to moisture and oxygen exposure, which can lead to seed degradation and loss of viability.
Moisture and Oxygen Risks
Plastic bags trap moisture and oxygen, creating an ideal environment for seeds to deteriorate. For example, a 1% increase in moisture content can reduce seed viability by 10-15%. To prevent this, seeds typically need to be stored at a humidity level below 10% and in an airtight container with desiccants or silica gel.
Alternative Storage Options
Glass jars or containers with tight-fitting lids are ideal for seed storage. These containers can be sealed with a vacuum sealer or by using desiccants to maintain dryness. Additionally, storing seeds in zip-top freezer bags or Mylar bags with oxygen-absorbing packets can also be effective. Some gardeners also use a combination of paper envelopes and airtight containers for long-term seed preservation.
Seed Storage Best Practices
When storing seeds, it’s essential to label the containers with the seed variety, date, and storage location. Seeds should be stored in a cool, dark place with a consistent temperature between 40°F and 50°F (4°C and 10°C). For optimal long-term storage, seeds should be kept in a temperature-controlled environment, such as a basement or a root cellar.
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