All seeds will be viable for one to two years. After two or three years, germination rates will drop for many types of seeds and will eventually fall to zero. So, stocking up on seeds for an “emergency” isn't a good idea because they don't last forever. Download a free chart that tells you if your seeds are too old.
The truth is seeds don't expire. They lose viability if stored improperly. While most seed companies will tell you to replace seeds every 2-3 years, those seeds will keep for decades and will germinate when planted if kept in a cool, dark, and dry place.
After soaking, plant your seeds immediately into moist soil. The seeds cannot be left to dry out again after soaking or they will likely not germinate.
Many perennials seeds can be sown right up to first frost. Veggies and other annual seeds need time to mature before first frost. How late you can start seeds outdoors depends on the type of seed and when you expect first fall frost in your area.
Some old seeds will stay good and germinate for up to 5 years or longer, while others are only viable for a year or two. On average, old seeds will still sprout for about three to four years after their “packed for” date – especially if they're stored in ideal conditions.
Yes! Even seeds that are thousands of years old can germinate. But proper pre-treatment is essential, and the older the seed, the less energy it has left in storage.
Water test: Take your seeds and put them in a container of water. Let them sit for about 15 minutes. Then if the seeds sink, they are still viable; if they float, they most likely will not sprout.
But if you start too late, they won't be mature enough for transplanting into the garden by spring. It takes a little practice, but in time you will be able to create your own seed planting schedule so you know exactly when to start each variety.
While you can plant a late planting to the first frost date, it's always best to allow as much growing time as possible. If you missed the spring planting, then calculate which vegetables you can grow now and still have a harvest before the first frost.
Age – All seeds stay viable for at least a year and most will be viable for two years. After the first year, the germination rates for out-of-date seeds will start to fall. Type – The type of seed can affect how long a seed stays viable.
By soaking the seed, it enables the new growth from the inside to push through the hard shell and grow. The seeds that could benefit from a good soaking include: corn, pumpkin, beans, chard, beets, and peas. The seeds you shouldn't soak include: carrots, lettuce, radish, celery, turnips, and spinach.
In a bowl, cover your seeds with warm water and leave to soak for 6-24 hours. Smaller seeds and those with thinner coats need the shorter time, and larger seeds with thicker coats need the longer period. Some seeds will naturally float, and some will stay below the surface.
Too much soaking in water and a seed will drown. It is recommended that you only soak most seeds for 12 to 24 hours and no more than 48 hours. The seeds of some species of plants can survive longer soakings, but you should only do this if the specific instructions for this species recommend so.
Exactly for how long seeds can maintain germination after storage under optimal conditions is not fully explored. But, it is assumed that seeds of many species can stay alive for centuries; some species may even survive for more than thousand years.
The oldest seed germinated is a 2,000-year-old date seed originally discovered at Masada in the 1960s and planted by Dr Sarah Sallon (Israel) of The Louis Borick Natural Medicine Research Centre in the Hagasa Medical Organization, Jerusalem, and Dr Elaine Soloway of Kibbutz Ketura, Israel, in 2005.
Depending on the type of seed, it is definitely not too late to plant grass seed in October. Cool season grass seed varieties like Jonathan Green Black Beauty grass seed do well with planting in October. The most important thing is to lay the seeds down at least 45 days before the first threat of frost.
Planting too deep (or not deep enough).
Small seeds such as basil, onions, and carrots should only be covered very lightly with soil or vermiculite. That's because these little specks of seeds don't have the energy within them to push through a lot of soil when they germinate.
Generally, seeds have to be planted four to six weeks prior to the cold season. The ideal period to sow seeds is typically between late March and late May. Let the plant have enough time to sprout and grow, so it can be moved to a new location.
Answer: Seeds kept in an airtight container do not sprout because there is not contact with air and water (moisture). Plants need water and moisture to grow.
Crops that are best started indoors include broccoli, brussels sprouts, cabbage, and tomatoes. Those with a slower root development, like cauliflower, celery, eggplant, and peppers, should also be started indoors.
Seeds in good condition and stored properly will last at least one year and, depending on the plant, may last two to five years.
Viability is the seed's ability to produce a vigorous seedling. Viability often declines before germination, so it's possible for old seed to germinate but produce weak seedlings.
Beans, like the Chocolate Runners, are among the longest storing seeds, often sprouting after a century in ideal storage conditions.