How to germinate cannabis seeds (paper-towel method)

Every cannabis grow begins with a single taproot pushing through a seed husk. Here's the method we recommend for every strain in our Canadian catalog. It's reliable, requires nothing more than what's already in your kitchen, and produces healthy seedlings ready for transplant in three or four days.

What you'll need

• Clean room-temperature water (filtered or de-chlorinated tap)
• Two ceramic plates
• Four sheets of unbleached paper towel
• A dark, draft-free spot at 20–25 °C — a kitchen cupboard works
• Optional: 60× pocket loupe (to inspect once seedlings emerge)

Nothing else. Forget about "germination boosters", expensive starter cubes, or heat mats. Cannabis seeds have evolved to germinate in damp dirt; we're giving them the same conditions in a more visible package.

Step 1 — Soak

Drop your seeds into a glass of clean water at room temperature. Set a timer for 12 hours.

Healthy seeds usually sink within an hour. Floaters often still germinate — don't bin them just for floating. Soaking softens the seed shell and triggers the embryo to start its growth program.

Don't go longer than 24 hours in water — without oxygen exchange the seed will start to drown.

Step 2 — Damp paper towels between two plates

Lay two sheets of paper towel on a ceramic plate and dampen them thoroughly (think "wrung-out sponge" — wet but not pooling).

Place your soaked seeds on top, leaving 1–2 cm between each. Cover with two more damp paper towels. Place a second ceramic plate on top, upside-down like a clamshell. This creates a dark, humid, oxygenated mini-chamber.

Step 3 — The waiting game

Move the plate-clamshell to a warm dark spot. 20–25 °C is ideal. A kitchen cupboard, a closet, or the top of a refrigerator (where motor heat keeps things slightly warm) all work.

Check every 12 hours. Re-moisten the paper towels with a spray bottle if they're drying out. Don't drown them — the seeds need air as much as water.

Most strains will show a white taproot within 24–48 hours. Some indicas and sativas take up to 96 hours. If nothing has happened by hour 96, it's likely a dud — our germination guarantee covers it.

Step 4 — Plant

When the taproot is 2–5 mm long (about the length of two grains of rice end-to-end), it's ready to plant.

Fill a small pot (10 cm wide is plenty) with pre-moistened starter medium — quality potting soil, buffered coco, or rockwool cubes. Make a 5 mm deep hole with your finger or a chopstick.

Drop the seed in, taproot pointing down. Gently cover with 5 mm of medium — don't pack it hard, just dust over.

Mist the surface and place the pot under gentle light. Most seedlings emerge above the soil in 2–5 days.

Common mistakes to avoid

• Planting too deep. Seeds run out of stored energy if they have to fight through 2 cm of soil. 5 mm max.
• Letting paper towels dry out. Seeds dehydrate fast at the early stage. Check twice a day.
• Too much heat. Heat mats are unnecessary at room temperature; over 27 °C kills germination rate.
• Touching the taproot with your fingers. Oil and friction damage it. Use tweezers or just tip the seed into the planting hole.
• Pre-fertilising. Seeds have their own food supply for the first 10 days. Plain water until first true leaves.

When seedlings emerge

Once you see the first round seed-leaves (cotyledons), you're in seedling phase. Reduce humidity slowly, increase light gradually, and don't feed nutrients for at least 7–10 days. Then start at quarter-strength.

At this point you have a viable cannabis plant. The next 12–18 weeks are about not killing it.