Scarlet ruellia

Scarlet ruellia (Ruellia coccinea) is a perennial herbaceous or subshrub species belonging to the Acanthaceae family. Within the agricultural sector, it is primarily categorized as an ornamental crop intended for greenhouse production, interior decoration, and landscaping in tropical or subtropical zones.

The plant originates from the tropical regions of South America, specifically Brazil. Due to its natural habitat in forest understories, it prefers environments with high humidity and filtered light. In commercial cultivation, it requires controlled conditions, often within specialized greenhouse facilities where climate parameters are strictly managed.

Botanically, the species is distinguished by its vibrant, tubular red flowers that grow in clusters. Its foliage consists of lanceolate or ovate leaves, which contribute to a dense, attractive canopy. The plant structure can become woody at the base as it matures, requiring pruning to maintain an optimal shape for commercial distribution.

Agrotechnical requirements focus on utilizing well-draining, nutrient-rich substrates with a slightly acidic to neutral pH. Proper development depends on consistent moisture levels and protection from harsh, direct sunlight, which can scorch the leaves. The ideal temperature for maximum productivity remains within the range of +20°C to +25°C.

• Consistent irrigation ensuring constant soil moisture.
• Application of balanced fertilizers during the flowering cycle.
• Pruning to stimulate branching and maintain plant vigor.
• Monitoring humidity levels to prevent fungal growth.

The main commercial use of Ruellia coccinea is in the nursery industry for high-quality indoor and ornamental plant markets. Pests such as spider mites and aphids are the most common threats to crop quality. Effective management involves integrated pest control strategies and maintaining sanitary greenhouse standards to prevent root rot and other moisture-related diseases.