Planting Onions, like most vegetables, thrive in rich organic soil. Prior to planting, work 2 to 4 in. (5 to 10 cm) of compost or humus into the soil. Plant onion plants 4 to 6 inches apart. Try to be careful about the fertilizers you use for onions. Onions tend to be more pungent when grown on soils with a high sulfur content. Choose a nitrate-based fertilizer over a sulfate-based fertilizer. Ask your local garden center expert for the right fertilizer. The fertilizer bag, even on all-purpose fertilizers, 12-24-12 for example, may indicate the components used to formulate the fertilizer.
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