AT A GLANCE
- Common Name: Tower of Jewels
- Scientific Name: Echium wildpretii
- Category: Plants
- Subcategory: Flowering Plants
- Range: Canary Islands, strictly endemic to the high-altitude subalpine volcanic caldera of Mount Teide on Tenerife and the high peaks of La Palma
- Habitat Type: Subalpine volcanic cinder fields, dry pumice screes, volcanic rock fissures, and high-altitude caldera plains between 1,400 and 2,200 meters elevation
- IUCN Red List Status: Near Threatened
- Lifespan: Monocarpic biennial or triennial (lives 2 to 3 years as a basal rosette, flowers once spectacularly in late spring, then dies after seed set)
- Diet: Autotrophic/Photosynthetic (deep taproot system drawing moisture from volcanic pumice gravel under intense ultraviolet radiation)
- Average Size/Weight: Flowering spike height 2 to 3 meters (rarely up to 3.5 m); basal rosette diameter 60 to 90 cm
- Key Defining Feature: Monumental, towering floral obelisk composed of a dense, conical spire rising three meters high, packed with up to 20,000 blazing coral-red or rose-pink nectar-rich blossoms
Overview
The Tower of Jewels (Echium wildpretii), locally known in Spanish as the ‘Tajinaste Rojo,’ is one of the most spectacular, awe-inspiring, and iconic flowering plants on Earth. Strictly endemic to the dramatic volcanic heights of Mount Teide on the Canary Island of Tenerife, this giant monocarpic biennial belongs to the borage family Boraginaceae. Spending its early years as a silvery, woolly rosette clinging to barren black volcanic rock, it erupts in late spring into an immense, fiery red obelisk reaching up to three meters in height, completely transforming the desolate caldera landscape.
Biology and Physical Characteristics
Echium wildpretii spends the first two to three years of its life as a dense, low, symmetrical rosette of narrow, linear-lanceolate leaves densely clothed in soft, silvery-grey hairs that reflect harsh alpine ultraviolet light and trap moisture from sea clouds. In late May, prompted by winter cold, the plant initiates explosive elongation, driving a colossal central floral spike skyward at up to ten centimeters a day. This monumental inflorescence is a dense, tapering thyrse packed with an astonishing 10,000 to 20,000 closely clustered, funnel-shaped, brilliant coral-red to crimson-pink blossoms with protruding stamens. The subspecies on La Palma (E. w. subsp. trichosiphon) bears pale rose-pink to violet-blue flowers.
Behavior and Ecology
Living in a subalpine desert environment subject to extreme temperature swings—baking daytime heat exceeding 40°C and winter snowstorms with severe frost down to -15°C—the Tower of Jewels relies on a deep, penetrating taproot that anchors it against violent mountain gale-force winds while tapping moisture deep within volcanic basalt layers. Its brief, glorious blooming window of three to four weeks produces copious volumes of high-sugar nectar, attracting legions of endemic Canary Island blue bees, bumblebees, and butterflies. Following pollination, thousands of tiny nutlets ripen, and the entire magnificent spire dries into a silvery woody skeleton, having exhausted all bodily energy in a single reproductive finale.
Conservation and Human Impact
The Tower of Jewels is listed as Near Threatened on the Spanish National Red List and protected within Teide National Park and Caldera de Taburiente National Park. Historical populations were severely overgrazed by introduced European rabbits and feral goats, but intensive park fencing, invasive herbivore control, and strict botanical protection have allowed wild populations to stage an impressive recovery across the caldera.
Interesting Factoid
The Tower of Jewels spends years growing as a small, quiet, silvery shrub, then suddenly shoots up an enormous ten-foot-tall floral tower covered in over 20,000 blazing red flowers, blooming once and dying in a blaze of glory.