Flame nasturtium

Flame nasturtium (Tropaeolum speciosum) is a perennial climbing plant belonging to the Tropaeolaceae family. It is distinct from the common annual nasturtiums due to its hardy nature, allowing it to act as a vigorous vine capable of covering large vertical surfaces with its delicate foliage and vivid flowers.

The species originates from the cool, moist temperate forests of Chile and parts of Argentina. In its native habitat, it grows in environments where its roots are kept cool in the shade, while the climbing stems reach upwards into dappled sunlight, a requirement that must be mirrored in cultivation.

Botanically, it features slender, twining stems and palmate, lobed leaves. The brilliant scarlet-red flowers are produced in abundance, often followed by fleshy, blue-black seeds. The plant’s ability to climb effectively relies on its sensitive petioles that wrap securely around available supports.

Cultivation requires specific site selection: it thrives in cool, humus-rich, well-drained soils. Consistent moisture is critical, as the plant does not tolerate prolonged drought or high summer soil temperatures. Providing a mulch layer to keep the roots cool is a recommended horticultural practice.

In ornamental horticulture, it is highly valued for creating spectacular displays on north or east-facing walls and fences. Common pests include aphids and red spider mites, while diseases such as powdery mildew can occur if airflow is poor and humidity levels are inconsistent.