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