Tower of jewels

The Tower of jewels (Echium wildpretii) is a striking biennial herbaceous plant belonging to the Boraginaceae family. During its first year, it develops a rosette of lanceolate, silver-grey leaves. In its second year, it produces a spectacular, spire-like inflorescence that can soar up to three meters high, densely packed with small, vibrant red to coral-colored flowers.

This species is endemic to the subalpine zones of the Canary Islands, particularly thriving on the volcanic slopes of Tenerife. Due to its natural habitat, it is a plant that prefers high-altitude climates with intense solar radiation and well-ventilated conditions. It is not frost-hardy and requires climate-controlled environments in regions with cold winters.

To successfully cultivate Echium wildpretii, one must provide excellent drainage. The plant is perfectly adapted to sandy, rocky, or gravelly soils. In heavier soils, amending with grit or pumice is essential to prevent root rot. The soil should be neutral to slightly alkaline, and excessive fertilization should be avoided as it can weaken the plant's structural integrity.

Agrotechnical care focuses primarily on moisture management. While the plant requires regular water during its initial growth phase, it becomes more drought-tolerant once established. Overwatering, especially during the dormant season, is the most common cause of failure. In pot culture, ensure the substrate is kept lean to prevent the "Tower of jewels" from becoming etiolated.

In landscape design, this plant is used as a dramatic focal point or "architectural" element in Mediterranean-style gardens and dry landscapes. Beyond its visual appeal, it is highly attractive to bees and other pollinators, making it an excellent addition to biodiversity-focused projects. Potential plant health issues include:

• Powdery mildew under humid, poor-ventilation conditions.
• Aphid infestations on succulent young flower spikes.
• Root rot caused by poor soil drainage.