Acmella calva

Acmella calva is a perennial herbaceous plant belonging to the Asteraceae family. Known for its medicinal properties, this crop has gained significant interest in agricultural sectors focused on the production of specialized botanical raw materials, specifically for its bioactive compounds such as spilanthol.

The plant originates from tropical regions of the Americas and has been introduced to various parts of Africa and Asia. It is highly sensitive to cold, which limits its outdoor commercial cultivation to tropical and subtropical regions. In cooler climates, it must be grown in greenhouses or as a seasonal annual crop to ensure consistent yield and prevent frost damage.

Botanically, it is characterized by its spreading habit, opposite leaves, and distinctive cone-shaped yellow inflorescences. The root system is shallow, necessitating frequent but controlled irrigation. The vegetative growth is vigorous under high temperatures and sufficient solar radiation, making it ideal for multi-harvest production cycles throughout the growing season.

Soil requirements for Acmella calva include well-draining, nutrient-rich soil with a pH ranging from 6.0 to 7.0. Agronomic management involves consistent fertilization with nitrogen-based products to support foliage development. Weed control is essential during the initial establishment phase, as the plant can be easily outcompeted by aggressive weeds.

The primary economic value of the plant lies in its extract, which is widely used in the pharmaceutical industry for its analgesic and anti-inflammatory properties. Furthermore, it is increasingly popular in the culinary sector as a unique ingredient. Common pests include aphids and spider mites, while fungal diseases can arise if soil drainage is inadequate, requiring careful management of water application.