Winter Sowing 101: Start Your Seeds Outdoors in the Snow

If you've ever balanced trays of leggy seedlings on every sunny windowsill in the house, winter sowing is about to change your life. It's exactly what it sounds like: you sow seeds outdoors, in winter, in clear containers that act like tiny greenhouses — and let our Canadian winter do the rest. Seeds get the cold period many of them need, germinate when the weather is right, and grow up hardy instead of pampered.

What you need

Clear or translucent containers with lids — 4L milk or water jugs are the classic — plus potting mix, seeds, duct tape and a permanent marker. That's it. No lights, no heat, no electricity.

How it works

1. Cut your jug around the middle, leaving a hinge at the handle. Punch drainage holes in the bottom and a few in the top half for air.
2. Fill the bottom with 8–10 cm of potting mix, water it well, and let it drain.
3. Sow your seeds on the surface and cover lightly, as the packet directs.
4. Tape the jug shut, label it (marker fades — write on tape too, or drop a label inside), and take the cap off so rain and snow can get in.
5. Set your jugs outside in a sunny spot and walk away. Snow on top of them is good — it insulates and waters slowly as it melts.

What to sow

Winter sowing works best for seeds that don't mind — or actively need — the cold: perennials, wildflowers, poppies, hardy herbs, and tough greens like kale and spinach sown later in winter. Many wildflower seeds actually germinate better after weeks of freeze-and-thaw. Tender heat-lovers like tomatoes and peppers are the exception — those still start indoors in spring. Browse our flower seeds for good candidates, and if you'd rather make your own seed bombs to plant out in spring, our DIY Seed Bomb Kit is a lovely snowy-afternoon project — and a sweet handmade gift.

In spring

When days warm up, watch for sprouts. On hot spring days, open the jugs so seedlings don't cook; close them again at night while frost threatens. When seedlings have a couple of true leaves and the weather settles, transplant them into the garden — they'll already be hardened off, because they grew up outside.

Winter sowing fits Canadian gardening perfectly: it works with our winters instead of against them, costs almost nothing, and frees up your windowsills. Start saving jugs now — your future spring self says thank you.