is this a trick question....i think it means plant 2 seeds every 4 to 6 inches...when they are one inch tall pluck out the weakest of the two...with one seed remaining every 4 to 6 inches...lol..i could be wrong.
also if you plant only one seed it might not germinate and you might have waited up to 14 days to find that out...then you will have to replant and wait another 14 days...that equals precious time lost ...
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