How to Prune broad-leaved everlasting pea?
Cut back to ground level in autumn

broad-leaved everlasting pea · Lathyrus latifolius
Also known as: everlasting pea; hardy sweet pea; perennial pea
Can be grown as a climber or allowed to scramble over banks and slopes. It copes with sun or partial shade in fertile well-drained soil. See sweetpea cultivation for further information
Cut back to ground level in autumn