In a life or death situation, surgery may be the only option. Meaning—only do this if nothing else has worked because this technique ruins as many seeds as it saves.
Scarification, or scuffing the shell, can also help water pass through an older seed’s tough outer shell.
If you’re going to keep seeds more than a year or two, proper storage will dramatically increase the chances of late-stage germination. Place them in an airtight container. Put the container in a refrigerator set at 6–8°C with 20–30% relative humidity. If excess moisture is a concern, add silica gel packs to the container.
4. SLICE THE SEED
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.
As you proceed through these steps, the risk of damaging your seeds past the point of recovery increases. Between each suggestion, give them a few days to a week to germinate. Allow the outside to dry each time to prevent rot. Do not try all or multiple techniques at once.
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.
To scarify your seeds, line a matchbox or other small container with sandpaper. Drop the seeds inside, shake vigorously for 30–60 seconds, then remove. You may not notice much of a difference, but the small micro-abrasions are sometimes enough to let water breach the shell and trigger germination.
The Class C drug is mainly being imported from the Netherlands and United Kingdom, Northern Ports NZ customs manager Dominic Adams said.
"We are finding cannabis seeds regularly in the mail system. In 2016 we got roughly 18,000 seeds; in 2017, 43,000 and it’s dropped down to about 19,000 so far this year.
Cannabis seeds are flooding New Zealand’s mail system with 19,000 caught at the border this year alone.
"The female plants are the ones that grow the buds which hold the highest tetrahydrocannabinol (THC) but if you have a male plant anywhere near them, instead of growing a bud, they will go straight to seed.
"These guys will import some seeds, we will seize them but before we have even had a chance to pass the information to police they will order some more," he said.