Echium simplex (Tower of jewels) is a herbaceous biennial plant which grows up to 3 m in height. It is endemic in the island of Tenerife mainly in Macizo de Anaga.
It is a frost intolerant species requiring sustained periods of sunlight to thrive. In its native environment it is largely confined to the area of Macizo de Anaga.
The plant is biennial producing a dense rosette in the first year and producing the distinctive inflorescence to a height of 1–3 metres (3 ft 3 in–9 ft 10 in) during the second year.
The flowers are white and the plant is in bloom from February to April in Tenerife.
E. simplex is widely available as a garden flower in warm temperate areas It is very attractive to bees and produces a distinctively flavoured honey.