It depends on the type. If the seeds and the soil dry out, then the seeds can die before they have a chance to germinate. If stored in a cool, dry place, grass seed can last for two to three years, but you may not get the same results as you would when planting fresh seed. The … Question: I just found a bag of grass seed I bought about 3 years ago.Is it still good? Lemon Grass 3 Lovage 1–3 Marjoram 1–4 Mexican Mint Marigold 4 Mountain Mint 4 Oregano 4 Parsley 1–4 Rosemary 1–4 Sage 1–3 Savory 1–4 Thyme 1–4 Valerian 2–3 Fruits Type Average Storage Life in Years Under ... “How Long Do Garden Seeds Last?” Oregon State University Extension Service, 2003. Try an experiment and germinate a few dozen seeds and see what your germination rate will be. Tips for Storing Seeds. Don’t Sow in Summer. Some varieties of tomato seeds have even been known to germinate after as long as 16 years! When Do I Replant After the Weeds Have Been Killed? Seed is only harvested 1 time a year (JUNE) that seed is then put into bags and sold in the Fall. After the grass seed finishes the process of germination, it will start to grow rapidly. As long as it is kept inside and dry it does not go bad. There is no one-size-fits-all when it comes to estimating seed longevity. The new grass will not be well-established with deep roots for about eight weeks, so mow your lawn carefully the first few times. Because lawn seed needs temperatures in excess of 8-10 degrees Celcius, many gardeners make the mistake of sowing seed during the summer only to see that it doesn’t germinate. Seed does NOT expire. Storing unused vegetable or flower seeds does require some care. As it consumes the nutrients in the soil, the grass will grow larger and larger. The first thing to do after seeding is watering new grass seed. The grass should be at least three inches tall before the first mow. Depending on the variety of grass seed you use, it can take as little as five to as long as 30 days for the grass to germinate. You might loose a few percentage points and you might have to seed … I have used two and three year old seed on my yard without problems. How Long Can I Store Grass Seed Before It Goes Bad? As the seed ages, the percentage of seeds that will be able to germinate diminishes, forcing you to use more seed than normal to get adequate coverage. Seed should stay viable for a long time if it is kept dry. Understanding how fast does grass grow from seed also takes understanding the factors a seed needs to germinate. I prefer seed that is over a year old versus a few months after it is harvested. However seed that is bagged and sold later the next year will actually germinate FASTER. Let us discuss the different types of herbicides available in the market and the time that we are required to wait before planting the grass seeds. This question can be easily answered if the chemical composition of the weed killer is known. This seed type is approximately 1/4 inch long with a baseball bat shape, so it compacts well into a burlap bag for storage. So, how long do seeds last? Cut carefully. However, the germination rate (the number of seeds that will grow) will decrease over time, so you may not get the same results you would if you were using fresh seed. In fact, some seeds, if properly stored, can be viable even after ten years. Louise L. Answer: Depending on the storage conditions, grass seed can remain viable from 1 to 7 years.It will last longest indoors under cool, dry conditions and much less in heat and humidity or in a tool shed where dramatic temperature swings occur. It is this reason you can’t leave your lawn for too long because you have to keep the soil moist. It’s just as important to understand when NOT to plant lawn seed so you don’t find yourself wasting both time and money. 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