I have grown these for the last 20 years and i find if you plant the largest of the aerial bulblits in late summer by winter they can be up to 20cm-8in tall, then late summer i harvest the ground crop and at the same time i replant the following years bulblits.Or the last 20 years i have increased the size of the harvested onions to about the size of billiard ball.The family likes them as are a more milder.
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