How to Germinate Cannabis Seeds at Home (Legally, in Ontario)

Ontario lets you grow up to four cannabis plants per household, and every one of those plants starts the same way: convincing a seed to crack open and push out a root. Growers call it popping a seed. It takes anywhere from a day to a week, it needs almost no equipment, and it’s where most first grows quietly fail.

What germination actually is

A cannabis seed is dormant. Give it moisture, warmth, and darkness and it wakes up, splits its shell, and sends out a single white root called the taproot. Once that taproot is a centimetre or two long, the seed is ready for soil. That’s the whole job.

Fresh seeds from a good source usually pop in 24 to 72 hours. Seeds that have been sitting in a drawer for two years can take a full week, and some never wake up at all.

The paper towel method

There are fancier ways, but this one works and costs nothing:

1. Wet two paper towels with room-temperature water. Damp, not dripping. If you can wring water out of it, it’s too wet.
2. Lay your seeds on one towel and cover with the other.
3. Slide the whole thing between two plates, or into a takeout container with the lid on loosely. You’re trapping moisture, not air-sealing it.
4. Put it somewhere warm and dark. On top of the fridge is the classic spot. You’re aiming for 21 to 26 degrees.
5. Check twice a day. If the towels are drying out, re-wet them gently.
6. When the taproot hits 1 to 2 cm, plant it taproot-down about a knuckle deep in your starter soil.

Where it goes wrong

The taproot bruises if you handle it, so move the seed by its shell or with clean tweezers, never by the root. Heavily chlorinated tap water slows things down; filtered water or tap water left out overnight is better. And the biggest one: impatience. People throw out viable seeds on day four that would have popped on day six. Wait the full week before you call it.

The legal part

Four plants per residence (not per person) is the Ontario limit, and your seeds need to come from a legal source such as the OCS or a licensed retailer. Landlords and condo boards can restrict growing, so check your lease before you invest in lights. Health Canada’s rules apply on top of the provincial ones.

Questions about seeds or starter gear? Ask at our High Park shop. A few of our staff grow at home and will happily talk your ear off about it.