You can store grass seed from one to five years before it goes bad depending on the type of grass. Smaller grass seeds tend to store one to three years and larger varieties three to five years, according to Oregon State University. Orchard grass is smaller seed than fescue grass. Thus, orchard would go bad before fescue.
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Exposing grass seed to moisture shortens the storage time before it goes bad. Mixing old grass seed with newer grass seeds lessens storage time. Experts including those at the United States Golf Association recommend storing grass seed in dry locations to extend storage life.
Expect grass seed to store a minimum of one year and up to five years, depending on the variety. Keep grass seed dry and do not mix purchases to extend the storage duration before it goes bad.
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