If you want big bulbs, you do need good spacing. But if you want maximum production per square meter, closer is certainly the way to go. I tried to find publications about ideal density but can't really find any, it's probably dependent on variety as well.
I myself like equidistant spacing, never really understood the logic of rows for things you don't walk through. Something like 15 cm is what I try to go for (6 inch) and I believe much more than that is not really useful if you have good sun.
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