Lathyrus nervosus

Lathyrus nervosus (Lord Anson’s Pea) is a rare, perennial sweet pea, which has blue flowers in early summer. Unfortunately it is not fragrant but the colour is very striking and will scramble over other plants. Its degree of perennialness has been a matter of debate, but it is now officially perennial (according to something I read and trusted); however I doubt it would survive in cold wet soil, but only in that much vaunted well-drained fertile soil in full sun. It is desirable and sought after.