To grow onions in a raised bed, follow these steps:
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Select a well-draining soil mix for your raised bed.
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Choose onion sets or seeds suited for your climate and desired onion type (bulbing or green onions).
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Plant onion sets or seeds in early spring, spacing them according to the variety's recommendations.
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Keep the soil consistently moist but not waterlogged throughout the growing season.
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Fertilize the onions with a balanced fertilizer periodically.
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Mulch around the plants to retain moisture and suppress weeds.
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Harvest the onions when the tops have dried and fallen over, then cure them before storage.