Spring onions regrow by replanting the root end, allowing new shoots to emerge from the existing bulb.
Here's a more detailed explanation:
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Harvesting: When harvesting spring onions, cut the green stems about 2-3 centimeters (approximately an inch) above the roots. This leaves the white bulb and root system intact.
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Preparation: Use the harvested green stems as desired in cooking.
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Replanting: Take the remaining root portion (the white bulb with roots attached) and plant it in a pot filled with potting mix or directly into your garden soil. Ensure the roots are buried, but leave a small portion of the white stem visible above the soil surface.
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Watering: Water the newly planted spring onion regularly, keeping the soil consistently moist but not waterlogged.
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Growth: Within a week or two, you should see new green shoots emerging from the replanted bulb. Continue to water regularly and provide sunlight for optimal growth. You can harvest the new green shoots as needed.
Essentially, spring onions are able to regrow because the base you replant contains the meristem tissue, the area where new growth originates. By providing suitable conditions like water and sunlight, the meristem tissue is activated, leading to the development of new leaves.
