Echium pininana

Echium pininana, the tree echium, pine echium or giant viper's-bugloss, is a species of flowering plant in the borage family Boraginaceae. It is endemic to the Canary Islands, where it is restricted to the island of La Palma. It is cultivated in gardens of Britain and Ireland, and it has naturalized along the northern California coast in San Mateo and Mendocino Counties. Its native habitat is laurel forests, where it is now endangered through habitat loss.
The Latin specific epithet "pininana" means "small pine", though "E. pininana" is neither closely related to the pine, nor does it resemble that plant.
It is a biennial or triennial, showing little more than a leaf in the first year, but subsequently producing a flower spike up to high with a dense mass of leaves and small blue flowers.
The plant is recommended for the southern maritime counties of England, the Channel Islands and the Scilly Isles. There are, however, reports of successful cultivation in the English Midlands and Yorkshire, albeit in favourable locations. Specimens are also grown in Dublin gardens at Howth and in the Irish National Botanic Gardens at Glasnevin. The plant also grows readily in North Wales where it seeds very widely. Although "E. pininana" is half-hardy in Britain and Ireland, it will self-seed to form clusters of plants, and it is suggested that by natural selection a hardier variety will emerge. The plant is most vulnerable to frosts in its first year. Because of its large leaves when partly grown, it is also very susceptible to wind damage. Hence a sheltered garden position is essential.
This plant has gained the Royal Horticultural Society's Award of Garden Merit.