How to Germinate Old Cannabis Seeds

If you’re looking for information on how to germinate old cannabis seeds, you’ve come to the right place. In this blog post, we’ll give you some tips and tricks on how to get your old seeds to sprout.

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If you’ve come across some old cannabis seeds, you may be wondering if it’s still possible to germinate them and grow a healthy plant. The good news is that it is possible to germinate old seeds, but there are a few things you’ll need to take into account.

The first thing to keep in mind is that the germination rate of old seeds may be lower than that of fresh seeds. This means that you’ll need to plant more seeds than you would normally in order to ensure that at least some of them germinate.

Another thing to consider is that old seeds may not produce plants that are as vigorous or healthy as those produced by fresh seeds. This is because the seed coat of old seeds may have become hardened and less able to absorb water and nutrients. For this reason, it’s important to start with high-quality soil and provide plenty of water and nutrients during the grow cycle.

If you decide to try growing plants from old cannabis seeds, be prepared for a slower, more challenging process than if you were using fresh seeds. However, with a little patience and care, it is possible to grow healthy plants from old cannabis seeds.

What You’ll Need

To germinate your old cannabis seeds, you’ll need:
-Cannabis seeds
-A container for germination (i.e. a plastic Solo cup with holes drilled in the bottom)
-Germination medium (i.e. rockwool, vermiculite, coco coir)
-A way to monitor the temperature and humidity of your grow space
-A water source

The Soaking Process

If you have old seeds that you want to try and germinate, the first step is to soak them. This will hydrate the seed and promote hair-like roots (called rhizoids) to grow from the base of the seed. Fill a cup with warm water (not hot!) and drop your seeds in. Let them soak for 12-24 hours.

After your seeds have finished soaking, it’s time to plant them. Get a small pot or tray and fill it with planting mix, perlite, or vermiculite. Make sure your planting mix is well aerated and drains well. Plant your seeds ½ inch (1 cm) below the surface of the planting mix and lightly press down on them so they make good contact with the soil.

Water your seeds lightly and place them in a warm, dark place. Make sure the soil stays moist but not soggy – Cannabis seeds will rot if they are too wet. Check on your seeds every day to make sure they are doing alright. In 5-10 days, you should see taproots poking out of the soil!

The Planting Process

To plant your old seeds, start by soaking them in a cup of purified water overnight. This will help to rehydrate the seeds and make them easier to plant.

Once soaked, fill a planting tray with a seed-starting mix or a mix of perlite and vermiculite. Make sure the planting mix is moist but not wet, as cannabis seeds need oxygen to germinate.

Use your finger or a chopstick to make small indentations in the planting mix, spacing the seeds about 2 inches apart. Gently place a seed in each indentation, then lightly cover with more planting mix.

Place the tray in a warm location out of direct sunlight and keep the planting mix moist by misting it with water as needed. In 7-10 days, you should see tiny seedlings emerging from the soil.

Once the seedlings have several sets of true leaves, they can be transplanted into individual pots filled with fresh potting mix. Water well and continue to grow your plants in a warm, sunny location.


We’ve come to the end of our guide on how to germinate old cannabis seeds. We hope you’ve found it helpful and that you feel more confident about trying this method yourself. Remember, the key is to be patient and to give your seeds the best possible chance to germinate by using high-quality, fresh media and making sure they have access to adequate light, water, and temperature conditions. With a little bit of love and care, those old seeds could sprout new life!

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