Name a cultural practice that can help prevent disease in ornamental plants.

Maintaining proper plant spacing to improve air circulation is a vital cultural practice for preventing disease in ornamental plants. When plants are spaced adequately, air circulation around them is enhanced, which helps to reduce humidity levels. High humidity can create an environment conducive to the development and spread of fungal and bacterial diseases. Improved airflow allows foliage to dry more quickly after rain or watering, further minimizing the risk of diseases like powdery mildew and leaf spots, which thrive in moist conditions.

In contrast, using synthetic fertilizers can sometimes lead to excess nitrogen, resulting in lush, dense foliage that is more susceptible to diseases. Overwatering frequently contributes to waterlogged soil conditions, which can promote root rot and other fungal diseases. Regularly applying pesticides, while sometimes necessary, does not address the underlying environmental conditions that foster disease, and can also lead to pesticide resistance if not managed carefully. Therefore, proper plant spacing serves as a proactive and environmentally friendly approach to reduce disease incidence in ornamental plants.