Folks, it's a piece of cake. Get some pots and potting mix, add roots of onions you've already eaten and watch them come up. But how much room do they need? I did a little experiment using 4 sizes of spacing to see if the extra room resulted in extra growth. I've labeled the pot sizes A (26 square cm each), B, C & D (largest 157 square cm each). All pots had more than one plant in, so I've given them numbers.
A1: Day 23 = 26cm, Day 26 = 30cm
A2: Day 23 = 22cm, Day 26 = 26cm
B1: Day 23 = 37cm, Day 26 = 38cm
B2: Day 23 = 27cm, Day 26 = 30cm
B3: Day 23 = 33cm, Day 26 = 35cm
B4: Day 23 = 12cm, Day 26 = 14cm
C1: Day 23 = 19cm, Day 26 = 23cm
C2: Day 23 = 19cm, Day 26 = 24cm
C3: Day 23 = 39cm, Day 26 = 43cm
D1: Day 23 = 29cm, Day 26 = 35cm
D2: Day 23 = 38cm, Day 26 = 43cm
So, for day 23, the size averages were 24cm, 27cm, 26cm & 34cm. In day 26 they were 28cm, 29cm, 30cm & 39cm. So it's pretty clear, if you want bigger onions, give them more space. However, the smallest onions only had one sixth of the space of the largest, so I wouldn't hesitate to plant them in tightly. At the density of pot A you can fit 385 plants in one square metre, but at the growing rate of 1cm / day, who needs close to 4 metres of spring onions every day?
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