I plant mine about ten inches apart. I am not sure why, but over the years I have observed that they do better, planted close. I thought it might have to do with pollination, but shading the roots is an interesting theory. Be sure to stake them, otherwise when the soil is saturated and it is windy they get blown over. It is good to mulch them as well. In a way the closer they are planted the higher will be your yield because the plant canopy fills 100% of the space, which is a very efficient use of space.
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