I have the peas for the hydroponic gh.
Pam the answer to your question - Plant one seed every two inches. Do not thin.
Other instructions: Plants perfrom best when supported by trellis. Support 2 rows at the same time by placing trellis between 2 rows and letting plants grow together.
Harvest (I'm I getting ahead?) when pods are filled out to encourage production.
When harvesting peas do not jerk pods from vines since rough handling can cause plants to stop producing. Best to snip clusters of pods from vines with scissors or pruners.
rita