Sowing Depth — The 3x Seed Size Rule
In short: Sowing too deep is a silent cause of poor germination. Depth = 3 times the seed diameter. Lettuce and celery require light access — don't cover them with soil at all.
Sowing Depth — The 3x Rule
A seed sown too deep will germinate but cannot break through the thick layer of soil. It dies underground without a trace.
Rule: depth = 3 × seed diameter
- Tomato (3mm) → 8–10 mm
- Cucumber (6mm) → 15–18 mm
- Pumpkin (12mm) → 3–4 cm
- Carrot (1mm) → cover very lightly, max 3 mm
- Lettuce → DON'T cover! Requires light for germination
Seeds requiring light (sow on surface, just press down):
- Lettuce, celery
- Marjoram, thyme, oregano
- Always check the package
Practically: After sowing, gently press down the growing medium. Water with a fine mist sprayer — a stream will move small seeds around.
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