Poinsettia

Poinsettia (Euphorbia pulcherrima) is a commercially significant decorative plant belonging to the Euphorbiaceae family. It is globally recognized for its vibrant bracts, which are often mistaken for flowers, serving as a primary crop in the floriculture industry during the winter season.

The plant originates from the tropical regions of Mexico and Central America. In its native habitat, it grows as a large shrub, but modern cultivars have been extensively bred for greenhouse production to achieve specific height, color intensity, and disease resistance suitable for retail sales.

Botanically, the plant features dark green, lobed leaves and small yellow structures called cyathia. The aesthetic value lies in the modified leaves known as bracts, which turn red, pink, or white in response to photoperiodic signals triggered by longer nights.

Successful cultivation requires strict environmental control. The crop thrives in porous, well-draining substrate with a pH of 5.8 to 6.2. Precise irrigation management is essential to prevent root diseases, while constant temperature maintenance ensures uniform bract development and prevents leaf abscission.

Commercial production faces challenges from various pests and pathogens that require integrated pest management strategies. Typical problems include:

• Whiteflies (Bemisia tabaci)
• Fungus gnats
• Spider mites
• Pythium root rot
• Botrytis blight