Narrow-leaved tutu

Coriaria angustissima, known as the narrow-leaved tutu, is a perennial subshrub belonging to the Coriariaceae family. It is endemic to New Zealand, primarily thriving in alpine and subalpine environments on rocky outcrops and gravelly soils.

The plant is distinguished by its fine-textured, fern-like foliage, which consists of numerous tiny, narrow leaflets. Growing typically as a low, spreading shrub, it creates a unique visual impact due to its delicate appearance despite its resilience in harsh mountain climates.

Successful cultivation requires soil that is exceptionally well-draining, as the roots are highly susceptible to rot in waterlogged conditions. It prefers a location with moderate light exposure, avoiding the intense heat of midday sun which can stress the foliage.

Climate needs include cool, humid conditions that mimic its native mountain habitat. It is generally hardy, but gardeners should provide shelter in regions with extreme winter frosts to protect the fine stems from freezing damage.

In terms of practical use, it is prized as an ornamental plant for rock gardens and borders. However, all parts of the plant are known to be toxic to humans and livestock due to the presence of tutin, a potent neurotoxin, requiring careful site selection.

The most significant threat to this species is root rot caused by poor soil aeration and excessive moisture. Establishing the plant in loose, rocky, or sandy substrates is the best preventive measure against fungal pathogens.

Pests such as mealybugs and spider mites may occasionally infest the plant, particularly in sheltered environments or when airflow is limited. Maintaining proper ventilation and humidity levels usually keeps these pest populations under control.