How to Store Garden Seeds
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Clean If Necessary
If you're saving flower or vegetable seeds from a commercial seed packet, they are already clean and do not need further preparation.
However, if the seeds were collected from an outdoor plant, they must be prepared and cleaned if necessary. For seeds from pods, such as those collected from beans (Phaseolus vulgaris), simply wait for the pods to become brittle and dry before removing the pods from the plant and breaking them open to exposed the dry seeds. Inspect each seed and remove any stems, pluck off chaff, and brush off dirt and other debris with clean, dry hands.
For seeds collected from moist fruits, such as squashes (Cucurbita spp.), scrape the seeds out of the fruit, separate the seeds from any flesh or pulp, and dry the seeds on a paper towel for three weeks.
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Place in a Sealed Container
Sealable glass containers are ideal for storing seeds. First, add an inch of uncooked rice to the bottom of the jar. Alternatively, sprinkle a couple tablespoons of dried milk into the jar. The rice or
dry milk sucks out the moisture in the air in the jar. Cover the rice or milk with a couple layers of clean tissue paper. Replace the dried milk in the jar every six months.
Place the vegetable seeds or flower seeds on top of the tissue paper. Seal the jar, then label the jar with the type of seed and the date you stored the seed. Only store one type of seed per jar. If there are multiple kinds of seeds, use multiple jars.
Stored seeds do best when kept at a temperature that ranges between 32 degrees and 41 degrees Fahrenheit. This makes a refrigerator ideal. University of Illinois Extension recommends storing the sealed jar in the bottom drawer of the refrigerator. Allow the jar and its contents to warm up to room temperature before opening. Opening while the jar is still cool can cause moisture to condense and the seeds will stick together.
For flowers, annuals typically last anywhere from one to three years, while perennial seeds can get stored for two to four years. Regardless of the type of seed, the sooner it gets planted, the better.Source: ehow.com