I’m harvesting peas! From my very own garden! I’m so over the moon about this!
The main things I changed:
Plant later than expected, the end of march or beginning of April for zone 4. Use good seeds from a local nursery. Feel free to put 2-3 rows right next to each other.
Things I would change:
Put the trellis right over the rows of peas so they climb directly up, not to the side.