Echium candicans aka Pride Of Madeira

Echium candicans is known as pride of Madeira. It belongs to the borage family, Boraginaceae. This evergreen subshrub grows only on Madeira in its native range. There, it grows on rocky cliffs and mountain terraces. It forms a broad mound and grows fast. Plants may live as biennials or short-lived perennials. They reach full size within one to two years.

Garden plants often stand 5–6 feet (1.5–1.8 metres) tall. The RHS gives a taller range, reaching 8.2 feet (2.5 metres). Spread varies between sources, from 4.9–10 feet (1.5–3.05 metres). Narrow, lance-shaped leaves have grey hairs and clear veins. The first year's growth forms a basal rosette of leaves. Flower spikes rise in the second year on biennial plants. Dense, spike-like panicles form at the ends of stems. Flowers range from white through pale blue to deep blue. Some blooms have a blue-purple shade. Flowering falls in spring and summer, with May–August listed by Missouri Botanical Garden.

Grow this plant in full sun with shelter from exposure. It needs soil that drains well and has moderate fertility. The RHS lists chalk, clay, loam and sand as suitable. It also lists neutral or alkaline soil. Plants tolerate dry soil and drought once growing outdoors. Missouri Botanical Garden gives USDA zones 9–11. It reports survival at lows of 20–25°F. The RHS gives the more cautious UK rating H1C. It advises protection from winter frost. Under glass, water well during growth and reduce watering in winter.

This broad plant suits borders, slopes and informal garden spaces. Its evergreen leaves provide interest beyond the flowering season. It also suits coastal gardens and sheltered courtyard sites. Flowers draw butterflies, hummingbirds and other birds. Deer tend to leave the plant alone. Plants can maintain a presence through self-seeding. That trait also carries a risk beyond garden beds. It has escaped gardens and spread in several regions. Some parts of southern California list it as invasive.

Serious pest and disease problems are uncommon. Slugs may attack plants outdoors. Under glass, watch for whiteflies and red spider mites. The RHS says plants need no pruning. Its hairs can irritate skin, so wear gloves when handling. The supplied evidence gives no edible use for this plant.