I've learned that my bush snow pea rows should be 2-3' apart, and to sow them 3" apart; but nowhere can I find how far apart the plants should be in the rows after thinning.
All members of the Pisum group grow thick. 2-3 inches is plenty. no need to thin. You can plant double rows 8-12 inches apart. you will need enough space between the doubel rows to pick them. Those are cool weather vegetables, not many places south of Alaska where you can grow them in the summertime.