How To Plant A Germinated Onion. # 1 | for most efficient growth, plant your nodding onion seeds in the fall. #2 | once germinated, keep your young nodding onion seedlings moist until they become established.
Add some additional soil to the pot until the bulb is almost completely covered. After four weeks plant the onions plantlets inside the greenhouse onion bed enriched with fertilizers and ideal soil.
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Alternatively, seed can be sown in containers at 1cm depth and once germinated, hardened off and planted outside with protection from birds. And be sure to leave 12 to 18 inches of space between each row to ensure a proper growing environment.