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When to Harvest Onions. In addition to good planting, you need to know when to harvest onions for the best flavor. Harvest tops for green onions as soon as they reach 6 inches in height. The longer you wait to harvest the green tops, the stronger they become.
How to grow Spring onions for propagating: As with scallions there is not enough of a bulb to be able to save and store for planting the next season. True spring onions don't usually form bunches, so they aren't perennial. They are biennial, growing a flower and seeding the second year.So let a plant or two go to seed and use the seed for your next crop.To onion lovers and growers here's where there is a difference. A green onion or bunching onion has gained the hint of a bulb with maturity; a scallion has no bulb and a spring onion has a small bulb.reen Onions or Bunching Onions. Green onions have long, green, delicate stalks and small, very slender, white bulbs. The bulb of a green onion is slightly defined. Green onions come out of the ground early in their lives... in fact you can sow them very early spring and usually pick them late spring 7 weeks later.