Certified Professional Horticulturist (CPH) Practice Exam

What is a benefit of using organic fertilizer for indoor plants?

1. Immediate nutrient availability

2. Less risk of nutrient runoff

3. Improves soil structure over time

4. Does not attract pests

The correct answer is: Improves soil structure over time

Using organic fertilizer for indoor plants offers the significant benefit of improving soil structure over time. Organic fertilizers often contain natural materials such as compost, manure, and bone meal, which, as they break down, enhance the soil's physical properties. This improves aeration, increases moisture retention, and fosters a healthy environment for beneficial microorganisms. As soil structure improves, it allows for better root growth and nutrient uptake, helping plants thrive. The gradual release of nutrients from organic fertilizers also aids in creating a more sustainable environment, reducing the likelihood of nutrient leaching. While immediate nutrient availability can be a concern with organic fertilizers, they typically release nutrients slower than synthetic fertilizers, making them less likely to induce rapid growth spurts that can compromise plant health. Additionally, while organic fertilizers may reduce the risk of nutrient runoff compared to synthetic options, this is not their primary contribution to indoor plant health. The concern of pest attraction varies and depends more on the specific organic material than on the use of organic fertilizers as a whole.