Centranthus ruber, Red Valerian: identification, distribution, habitat
How to Grow and Care for Red Valerian | BBC Gardeners World Magazine
Centranthus ruber - Wikipedia
Growing Red Valerian Plants: Information On The Care of Ceranthus Jupiter's Beard | Gardening Know How
LNR plant of the week: Red Valerian – Friends of Shoreham Beach Local Nature Reserve
Agroforestry Research Trust - Red valerian (Centranthus ruber) has nice edible younger leaves that taste of broad beans. Like a dry sunny site and often seen growing out of walls in England.