I have read that deep planting could cause thick stems, but I am not sure about it.
Like Worth, I plant my onions so that most of the bulb is above ground. My MIL told me that his father used to plant deeper and when the onions started bulbing, he carefully exposed the top of the onions by removing the soil around the bulb without disturbing the roots.
Sari
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"I only want to live in peace, plant potatoes and dream."
- Moomin-troll by Tove Jansson
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