I think they were only about 4" apart! I learned from an experienced gardener and couldn't believe how close the bulbils were when I saw them at a community garden (thought it must have been a newbie who didn't know any better!!!) When you think about it, why would they need a ton of space?
I planted mine in full sun in some aged cow manure and mulched them with bark chips. I was very happy with my harvest, one of the best
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Linda