From the page: The disposable cup deserves a second chance
Idea 3
Mini germination greenhouse
Germinating seeds under cover is an old nursery technique: the cup becomes a mini greenhouse that traps moisture and warmth around the seed. With stable humidity and mild temperature, the seed wakes from dormancy faster and the seedlings get stronger before transplanting.
What you need
- Clean plastic cups (one for planting, another for the lid)
- Sifted soil or light potting mix
- Seeds (beans, arugula, basil, sunflower)
- Scissors or a hot nail for poking holes
- Spray bottle with water
- A label or small piece of paper to identify them
How to make it
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1
Make 3 or 4 holes in the bottom of the cup with the hot nail: excess water needs to escape, or the seed will rot.
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2
Fill the cup with soil up to two fingers from the rim and moisten with the spray bottle before sowing — damp soil, not soaked.
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3
Place 2 or 3 seeds at a depth of about twice their size and cover lightly with soil.
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4
Nest the second cup on top upside down as a lid, forming a clear dome that holds in heat and moisture.
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5
Keep it in a bright spot out of direct sun and lift the lid a few minutes each day to refresh the air and prevent mold.
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6
Once the first true leaves appear, remove the cover for good and transplant the strongest seedling.
Finishing touches
Write the seed name and date on the label taped to the cup — it helps you compare germination. Afterward, the cup can be washed and become a mini greenhouse again for several seasons.
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