Landscaping License Practice Test

Which of the following materials is best for ensuring good drainage in a garden?

1. Clay

2. Sand

3. Organic matter

4. Peat moss

The correct answer is: Sand

Sand is recognized for its excellent drainage properties in garden settings. It consists of larger particles compared to other soil components, allowing water to flow through more freely. This characteristic is crucial for preventing waterlogging, which can lead to root rot and other issues detrimental to plant health. In contrast, clay tends to retain water due to its small particle size and compactness, leading to poor drainage. Organic matter can improve soil structure and nutrient content, but when used alone, it may not provide the optimal drainage needed, especially in heavy soils. Peat moss, while beneficial for moisture retention, can create a spongy texture that may not enhance drainage sufficiently, as it tends to absorb water rather than allowing it to easily pass through. Therefore, selecting sand will ensure that excess water drains away effectively, promoting a healthier environment for plants.