Certified Professional Horticulturist (CPH) Practice Exam

What technique is commonly used to protect plants from frost in colder months?

1. Watering in the morning

2. Covering with frost cloths

3. Applying mulch only

4. Pruning branches

The correct answer is: Covering with frost cloths

Covering with frost cloths is an effective technique to protect plants from frost during colder months. Frost cloths work by creating a barrier between the cold air and the plant, helping to trap heat radiating from the soil and preventing frost from settling on the plant leaves. These cloths are typically made from lightweight, breathable fabric that allows light and moisture to penetrate while providing insulation against freezing temperatures. This method can be particularly beneficial for tender plants that are more susceptible to frost damage. In contrast, watering in the morning may not offer sufficient protection against frost. While proper hydration helps plants overall, it does not physically shield them from cold temperatures. Applying mulch can help regulate soil temperature and retain moisture, but it primarily influences the soil environment rather than directly protecting the plant foliage from frost. Pruning branches, while useful for plant health in other contexts, does not provide any protective barrier against frost and could potentially expose the plant to more cold damage. Thus, using frost cloths is the most direct and effective method for safeguarding plants from frost.