Over the previous week, I've been taking measurements of my spring onions to see how I should be harvesting. I grew two groups of crops, one harvested back to the base and one harvested so that there were shoot stumps remaining.
Day 2: No Stumps: 5.6cm each - Stumps: 5.7cm each
Day 4: No Stumps: 12.2cm each - Stumps: 11.7cm each
Day 5: No Stumps: 14.2cm each - Stumps: 14.0cm each
Day 6: No Stumps: 18.0 cm each - Stumps: 16.7cm each
Day 7: No Stumps: 21.6cm each - Stumps: 19.2cm each
It's pretty definitive - prune your spring onions back to the base and you will have better growth. I harvested them again today (this will probably be a weekly occurance) and they all went back to the base. It was pretty surprising that the results were so clear - I was expecting nothing too big.
By the way, growing spring onions is a cinch. I got 12g of shoots from one week. Why would you ever buy spring onions?
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