When it comes to growing your own cannabis, there’s a lot to learn. You’ll pick up most of the information as you go. One of the most common questions for… If you have some extra cannabis seeds lying around, you're probably wondering how long you can expect them to last. Weed seeds can survive in the soil for years before they germinate and grow.
How Long Do Cannabis Seeds Last?
When it comes to growing your own cannabis, there’s a lot to learn. You’ll pick up most of the information as you go. One of the most common questions for growers is “how long do cannabis seeds last?” The answer is not always clear.
Cannabis seeds will last longer if they’re stored properly out of harm’s way. If you don’t know the best way to store your seeds, read on. We’ll answer “how long do cannabis seeds last” and give you some tips for getting the most out of your seeds.
Keep in mind that there is no concrete answer for how long cannabis seeds will last. In fact, the only guarantee is that it depends on many things. Storage, the specific strain, and other factors will affect the lifespan of your seeds.
Marijuana seeds last the longest in the refrigerator
As with many things related to growing cannabis, there is some debate about the best ways to store seeds. There is also plenty of debate surrounding how long they will last in any given storage space.
Leafly says that seeds must be properly stored to prevent mold or pathogens from spoiling them. They should be stored in a cool, dark place and can be used within 16 months. If you’ll be waiting longer than 16 months, it’s best to put them in the freezer to use in the future.
However, some suggest that seeds can last for years when stored in a cool, dark place. Like we said, there is plenty of debate surrounding best practices for growing weed. If you have stored your seeds in a cool, dark place for a long time, examine them thoroughly and be cautious. Expect to lose more seeds as time goes on, though. The longer they sit in storage, the more likely it is that some won’t germinate.
So, to be on the safe side, it’s best to refrigerate or freeze your seeds for long-term storage.
If they’re not stored in a cool, dark place, and are instead stored in regular conditions, they will last significantly less time. Some sources suggest they will only last a few months in regular conditions. If you don’t plan to use your seeds in the near future, it’s best to store them somewhere cool and dark to prevent pathogens and mold.
As a general rule, try to use your cannabis seeds within the first three years of obtaining them. Five years is considered very old for seeds. The quicker you can germinate and use your seeds, the better. In fact, the longer you wait, the less likely it is that the seeds will germinate at all.
What factors affect cannabis seed longevity?
First of all, try to keep your seeds in their original packaging if possible. This will prevent them from being exposed to light or other no-nos. If they’re already out of the packaging, that’s okay. Keep them in a sealed container, in a dark, cool place. Or sealed in the refrigerator or freezer.
It’s not necessary to freeze your seeds, but some people prefer to freeze them instead of refrigerate them. If you don’t open your freezer as often as you open your fridge, it may be logical to freeze them instead. This will prevent frequent temperature changes and potential light exposure.
Additionally, too much or too little humidity and the presence of oxygen can also affect the longevity of your seeds. Keep ‘em cool. Keep ‘em dark.
And don’t forget genetics and quality. Some seeds will just fare better than others because they are higher quality and more durable.
What happens when cannabis seeds are stored improperly?
If seeds are exposed to light or rapid temperature change, this can trigger a number of events that will damage their longevity.
First, it can trigger them to use up their nutrient stores before they should be used. This means when it’s time to germinate, they won’t have enough nutrients. Exposure to high humidity can trigger fungi growth.
Here’s some more information about how humidity can affect cannabis seeds, courtesy of Royal Queen Seeds.
If the storage space has an 8-9% level of humidity, it may eventually attract pests and insects. Once it hits 12-14% humidity, it’s possible for fungi to grow inside and outside of your seeds.
When humidity levels reach higher levels, around 18-20% humidity, the seeds will begin to sweat. Once you’ve reached 20-30% humidity, it’s a good idea to store your seeds. Around 40-60% humidity will lead to germination. You don’t want this if you’re not using your seeds yet. And finally, 80-100% humidity will cause seeds to drown and wilt in less than a day.
Best practices for storing your cannabis seeds
If you don’t plan to wait a long time, you can store your seeds in a cool, dark place. However, if you want to be extra certain they will survive, refrigerate or freeze them.
When you refrigerate or freeze your seeds, you need to protect them from your regular use. You don’t want your seeds getting exposed to light and temperature changes on a regular basis because they’re in your fridge. So, store them in the device you use less often (or better, a second fridge you rarely use) to prevent frequent temperature changes.
The best way to store them in a refrigerator or freezer to keep them in a nice, airtight container. Ziplock bags are a good choice because you can squeeze most of the air out and create a tight seal over your seeds. But don’t stop at the bags. Once you’ve sealed them in a ziplock bag, you’ll need to put it inside a darker bag or container. This will prevent deterioration from light every time you use your fridge.
It is possible to expose your seeds to excess moisture if they’re improperly stored in the refrigerator or freezer. If you don’t plan to leave them for long, you can skip the fridge and store them in a dark, cool zone. But if you do use the refrigerator to store cannabis seeds and want to make sure they don’t get too much moisture, you could add a little bit of uncooked rice to their container. Some growers suggest this will absorb excess moisture and prevent the seeds from deteriorating.
As with many things cannabis and gardening, different people like to use different methods. What works for you may not be someone else’s cup of tea.
But when it comes to storing seeds, you need to be careful. It’s crucial to keep them in an environment that prevents them from getting damaged and losing their ability to germinate.
The best way to store your seeds will depend on many factors. Assess how long you plan to leave them for, the quality of the seeds, and the storage spaces you have available before deciding how to store them. And good luck!
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How Long Do Marijuana Seeds Last? (Explained)
If you have some extra cannabis seeds lying around, you’re probably wondering how long you can expect them to last.
The germination rate of Marijuana seeds naturally declines over time. However, if stored correctly, your seeds can last for up to 5 years. However, to last that long, they need to be good quality and be stored in a cool, dry, and dark place.
Read on to find out how to store your seeds correctly to make them last longer.
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How Long Do Marijuana Seeds Last?
Cannabis seeds can last for a very long time if they are stored in the correct conditions. The ideal storage temperature for cannabis seeds is between 7-10°C (45-50°F), with a humidity level of around 55%. Under these conditions, your cannabis seeds should last for many years.
However, it is worth noting that the shelf life of cannabis seeds will decrease if they are exposed to light, heat, or excessive moisture. Therefore, it is important to store your seeds in an airtight container in a cool, dark place.
If you are planning on germinating your seeds at some point in the future, it is worth testing a few to check their viability first. The best way to do this is to place the seeds in a cup of water overnight. After 24 hours, check to see if any of the seeds have sunk to the bottom of the cup. If they have, this indicates that they are still viable and should germinate successfully.
How To Tell If Your Cannabis Seeds Are Still Good
Many growers have experienced the frustration of planting cannabis seeds, only to have them fail to germinate. If you’re wondering whether your stored cannabis Seeds are still good, there are a few things you can do to test them. One simple way is to do the float test: Take a glass of distilled water and drop it in your seed. If it sinks, it’s probably still good. If it floats, it’s not going to live.
Also, give the seed a light squeeze between your fingers. Healthy cannabis seeds should be firm, with a dark brown or black coloration. If they’re pale or green, they’re not going to sprout. If they’re hard and brittle, they might be too old.
The best way to tell if your seeds are still good is to try germinating them. Plant two or three seeds in moistened soil, and wait a week or two to see if anything happens. This method isn’t foolproof (sometimes seeds just don’t want to germinate), but it’s the most reliable way to tell if your precious cannabis seeds are still alive and viable.
Will Cracked Marijuana Seeds Still Germinate?
The simple answer is yes. However, it is worth noting that the germination rate for cracked seeds is often lower than for intact seeds. In addition, the process of germinating a cracked seed can be more difficult and time-consuming. When a seed is cracked, the protective outer coat is damaged, exposing the delicate inner tissue to the elements. This makes it more susceptible to infection and less able to absorb moisture. As a result, it can take longer for a cracked seed to germinate, and the plant that emerges may be weaker than one grown from a healthy seed. Despite these challenges, it is still possible to successfully grow a plant from a cracked marijuana seed. With patience and care, you can end up with a bountiful harvest of high-quality buds.
How To Make Your Marijuana Seeds Last Longer?
Let’s take a look at some of the main ways you can make your marijuana seeds last longer.
1. Store Them Properly
You can prolong the shelf life of your marijuana seeds by storing them properly. Keep them in a cool, dark place, like a pantry or cupboard. You can also store them in the fridge, but make sure they’re in an airtight container so they don’t dry out.
If you live in a humid climate, it’s a good idea to store your seeds in the fridge or freezer to prevent them from going bad.
If you have a lot of seeds, you can also store them in a Mason jar or vacuum-sealed bag. Just make sure to label the container with the date so you know when they were stored.
A Ziplock bag works well when you want to store seeds for a short duration of around 5-6 months. Any longer than that and your seeds may start to go bad.
Put your seeds into your bag, try to remove as much air as possible and then seal it tightly. Then keep your bag in a cool and dark place.
A step further than a regular Ziplock bag, a vacuum-sealed bag will ensure that there is no air left inside your bag.
This will allow you to store your seeds for a longer period.
You will still need to ensure to keep it in a cool, dark environment.
Some seed banks deliver seeds in a vacuum-sealed package that can store them until they’re ready for planting.
Another great method for long term storage is keeping your seeds in an airtight container.
Glass containers are preferable as they are more resistant to heat and UV ray damage.
Just make sure to keep them away from light.
If you are looking to store your seeds for over a year, you can refrigerate them.
Refrigerators offer constant low temperatures and dark and moisture-free environment.
Keep your seeds at the back of your fridge so that they are away from any potential moisture or temperature changes from opening it often.
Make sure the container or bag your seeds are in is airtight and heatproof.
You will also want to make sure that your fridge is “no-frost” or has a no-frost area to shield seeds from frost damage.
Freezing marijuana seeds is a debated method.
Freezing is used by some to store their seeds for years on end.
Others say that it ends up killing seeds instead of protecting them.
Some growers even believe that freezing seeds can damage their internal cells.
Using special laboratories and equipment can allow for the careful freezing of seeds, but this is not a very cheap or accessible option for many.
Now that we have covered everything there is to know about how long marijuana seeds last and how to store them, you are all ready to begin your growing adventure. We’ve made sure to cover all our bases- from basic seed facts to how to choose the best seed bank.
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Hi, I’m James, the founder of GreenBudGuru. I started this site in 2018 to help new cannabis growers avoid the common mistakes that I made as a beginner with easy-to-follow guides. GBG is now read and trusted by over 100,000 people each month.
How long do weed seeds survive in the soil?
CORVALLIS – Weed seeds can survive in the soil for years before they germinate and grow, according to Jed Colquhoun, weed specialist with the Oregon State University Extension Service.
Why should home gardeners care?
“If you combine the longevity of seeds in the soil with the fact that weeds such as common lambsquarters can produce over 500,000 seeds per plant, the incentive to hand weed your garden becomes much greater,” said Colquhoun.
“Prevention is the most effective form of weed control,” he said.
Here are some basics on weed seed biology:
Undisturbed weed seeds tend to persist longer than seeds subjected to periodic tillage. Weed seeds in deeply worked soil tend to last longer than seeds in shallowly worked soil. Seeds deep in the soil are “stored” below the germination zone.
Grass seeds tend to be less persistent than broadleaf weed seeds.
The number of surviving seeds of most weed species declines rapidly the first year. But thereafter the rate of weed seed decline slows. Some seeds can persist for decades.
As many as 130 million seeds per plow acre were found in a Minnesota study.
Different species of weeds have seeds that last varying numbers of years in the soil. The scientific literature provides some information about seed longevity, including:
- Brome grass seed seldom lasts more than two years.
- Annual ryegrass – up to nine years.
- Perennial ryegrass – up to three years.
- Annual bluegrass – up to about five years.
- Wild oats – three to six years, but longer in deep soil.
- Jointed goatgrass – three to five-and-a-half years.
- Barnyardgrass – up to 13 years.
- Quackgrass – up to four years.
- Common velvetgrass – 10 years or more.
- Mustards – are long lived. Seeds excavated from a monastery in Denmark were dated to be 600 years old and 11 of them germinated. More commonly, mustard seeds last for decades.
- Lambsquarters – may last up to four decades.
- Russian thistle (tumbleweed) – short lived, most live only a year.
- Wild carrot – several years.
- Curly dock – more than a decade.
- Canada thistle – more than two decades.
- Field bindweed – more than 50 years.
- Leafy spurge – at least a few years.
- Common groundsel – most die within a year.
Scientists found lotus seeds in Manchuria that germinated after over 1,000 years, said Colquhoun.