Try dropping your old seeds into a glass of sparkling water. The CO₂ in the water should help the seeds absorb more moisture, encouraging them to sprout. You can also add some fulvic acid to the water to help break down the shell of your seeds. You’ll only need about 2.5ml of acid for a glass of sparkling water (roughly 250ml).
If you’ve tried all our tips above and still haven’t managed to germinate your seeds, it’s likely they are beyond the point of return. To avoid having the same problem next time, here are some tips to help you store your seeds:
If this isn’t enough, you can try carefully (and very gently) using a sharp knife like a Stanley blade to remove the ridge running along the middle of each seed. This should expose the inside of the seed a little, helping it absorb moisture and, hopefully, giving it a better chance of germinating.
TRY “THE PAPER TOWEL METHOD”
1. Place 2 pieces of paper towel inside a salad plate.
2. Dampen the paper towels and place your seeds on top of it.
3. Cover the seeds with another 2 pieces of damp paper towel, then cover the salad plate with another plate, and keep it in a warm, dark cupboard.
4. Check on your seeds every 2–3 days.
Before you start, it’s important you remember the following:
Sometimes, it’s best to leave Mother Nature to work her magic on your old seeds. Try scarring your seeds a little as we showed you earlier, then let them sit in carbonated water overnight. Next, prepare a small nursery pot with some high-quality soil. Make a small hole in the middle of the pot with your finger, roughly the depth of your fingernail. Drop your seed inside the hole and cover it. Moisten the soil and keep your pot in a warm place with indirect sunlight—a windowsill works great.
• Some seeds won’t germinate at all. Unfortunately, old seeds sometimes just don’t sprout. So, if you try all of the tips below and wait patiently without any luck, it’s likely your seeds are just too far gone.
To discourage any light from getting in, place the seeds in an opaque container. While it’s unlikely that the seeds will enjoy much sunlight in your crisper drawer, placing the seeds in a small container means that you can more readily control their immediate environment. On top of shutting out light and excess moisture, place small bags of silica gel in with the seeds. This will help prevent any excess moisture build up, effectively keeping your seeds viable for extended periods of time.
One of the best, and most readily available, places to store seeds long term is to stick them in a refrigerator. Ideally, you don;t want to freeze the seeds, as any moisture that may be contained inside can crystallize and harm the future seedling. So, keeping them at a cool 6-8 degrees Celsius (42-46º F) is far better than a deep freeze. That will pretty much obliterate the heat element.
Germinating old seeds can be difficult, if not impossible, if it’s not done exactly right. That being said, it is possible. So before you toss those marijuana seeds that you’ve been keeping at the bottom of an old baggie, be sure and give this a read. But, let’s just start with how to store seeds the right way, so you won’t have to bust out those superpowers next time.
As they say, not all heroes wear capes, and absolutely zero of them toss old seeds.
You might find yourself asking “How long do marijuana seeds last?” This is a great question, and the answer almost solely depends on the methods of preservation. Depending on how you’ve stored your seeds, they can essentially last indefinitely.
Scarification, or scuffing the shell, can also help water pass through an older seed’s tough outer shell.
Keep the water warm, but not too hot. Aim for around 22°C. Avoid direct sunlight, and keep an eye on the glass. Do not soak seeds for prolonged periods, more than 24 hours can deprive them of oxygen and make them drown.
The older a cannabis seed gets, the harder it is to pop. But hard doesn’t mean impossible. If you’ve been saving your seeds for a rainy day and it finally started pouring, these tips could help you get most, if not all, of your old beans to germinate.
When your old cannabis seeds don’t want to pop, one of these four techniques could come to their—and your—rescue. Aging seeds are more difficult to grow than fresh ones and we’ll explain what you can do to help germination.
As cannabis seeds age, their protective outer shell hardens and prevents water from passing through. Unless the tiny, dormant embryo that lives inside the shell detects moisture, it doesn’t know that the conditions are right to sprout. As a first step, pre-soak your old cannabis seeds for about 12 hours to see if that does the trick.