Photographed in the grounds of King’s College, Cambridge. From memory they were about six feet tall (1.83m)
See the details below that says the flowers can grow up to 4m long. (13 feet)!
Interesting plants, yes?
From the Royal Horticultural Society
Other common names
giant viper’s bugloss
tower of jewels
Echium can be annuals, biennials, evergreen perennials or shrubs, with simple, coarsely hairy leaves and funnel-shaped flowers borne in panicles or dense spikes in summer
Echium pininana is a rosette-forming biennial or short-lived perennial with lance-shaped, roughly silver-hairy leaves to 7cm long. Each rosette produces a flower panicle up to 4m long of funnel-shaped blue flowers with large bracts in mid and late summer
Hat tip to Nicole Gipps of ThatSuperGirl for naming the plant.