Cut carefully. 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. This seed type is approximately 1/4 inch long with a baseball bat shape, so it compacts well into a burlap bag for storage. In fact, some seeds, if properly stored, can be viable even after ten years. The … Question: I just found a bag of grass seed I bought about 3 years ago.Is it still good? The first thing to do after seeding is watering new grass seed. Some varieties of tomato seeds have even been known to germinate after as long as 16 years! Storing unused vegetable or flower seeds does require some care. If stored in a cool, dry place, grass seed can last for 2-3 years. 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. 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. Understanding how fast does grass grow from seed also takes understanding the factors a seed needs to germinate. Seed should stay viable for a long time if it is kept dry. As it consumes the nutrients in the soil, the grass will grow larger and larger. 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. Seed does NOT expire. Don’t Sow in Summer. However seed that is bagged and sold later the next year will actually germinate FASTER. The new grass will not be well-established with deep roots for about eight weeks, so mow your lawn carefully the first few times. 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. 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. This question can be easily answered if the chemical composition of the weed killer is known. There is no one-size-fits-all when it comes to estimating seed longevity. As long as it is kept inside and dry it does not go bad. When Do I Replant After the Weeds Have Been Killed? Tips for Storing Seeds. It’s just as important to understand when NOT to plant lawn seed so you don’t find yourself wasting both time and money. How Long Can I Store Grass Seed Before It Goes Bad? I prefer seed that is over a year old versus a few months after it is harvested. 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. 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. 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. 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. Try an experiment and germinate a few dozen seeds and see what your germination rate will be. It is this reason you can’t leave your lawn for too long because you have to keep the soil moist. 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