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Winter Sowing Native Seeds & Perennials
Winter sowing in milk jugs is an easy way to start hardy seeds outdoors while it's still cold. The jug acts as a miniature greenhouse, protecting seeds from birds and heavy wind while providing the "chill" many native plants and perennials need to germinate.
Materials Needed
- Empty plastic milk or water jug (translucent/clear works best)
- Sharp utility knife or heavy-duty scissors
- Duct tape
- Hammer and a large nail (or a drill)
- Potting Soil
- Native or Perennial Seeds (Seeds are available at the Seed Exchange counter at the Evesham library.)
Click above for more info on the Marlton Seed Exchange.
Clean & Prep
Create Drainage Holes
Create Drainage Holes
Thoroughly rinse the jug to remove any milk residue, which can cause mold or odors. Discard the cap. You will not need it; the open top allows for essential ventilation and lets rain/snow enter.
Create Drainage Holes
Create Drainage Holes
Create Drainage Holes
Flip the jug over. Using a hammer and nail or a drill, poke at least 6–8 large holes in the bottom.
Don't skip this! Without proper drainage, your seeds will drown during spring rains.
The Hinge Cut
Create Drainage Holes
The Hinge Cut
Cut the jug horizontally about 4–5 inches from the bottom (deep enough to hold a good amount of soil).
Cut around the perimeter, but stop just before you reach the handle.
Leave about 1–2 inches of plastic intact under the handle to act as a hinge. This allows the top to flip back while you plant and stay attached in the wind.
Fill & Plant
The Hinge Cut
Flip the top back and fill the bottom with 3–4 inches of pre-moistened potting mix.
Sow your seeds according to the packet depth.
Label & Seal
Label the jug with a permanent marker.
Flip the top half back down so it sits flush with the bottom.
Seal the jug back together with duct tape.
Placement
Place the jugs outside in a spot where they will get sun and be exposed to the elements (rain/snow) but be protected from winds that could blow them around.
Maintenance Tips
Check Moisture: Look for condensation on the inside of the plastic. If the jug looks dry and light, add water through the top hole.
Success! Once the weather warms up and the seedlings have their first true leaves, you can peel back the tape and flip the lid open during the day to prevent them from overheating.