Texas FFA Nursery Landscape Practice Exam

What soil condition is most unfavorable for planting grass?

1. Low moisture retention

2. Acidic pH levels

3. Excessive shading

4. Poor drainage

The correct answer is: Poor drainage

Poor drainage is the most unfavorable soil condition for planting grass because it directly affects the roots' ability to access oxygen and can lead to waterlogged soils, which can suffocate grass roots and promote diseases. Grass species generally prefer well-drained soils that allow excess water to flow away while retaining enough moisture for healthy growth. When water accumulates due to poor drainage, it increases the likelihood of root rot and other fungal diseases, which can severely hinder the establishment and health of grass. Other conditions, while potentially impactful, do not have the same severe immediate effects on grass planting. Low moisture retention might mean the grass struggles to obtain sufficient water, but it can still grow if other conditions are favorable. Acidic pH levels can inhibit nutrient uptake, yet many grass species can adapt to a range of pH levels. Excessive shading also poses challenges by limiting the sunlight required for photosynthesis, but it primarily impacts the grass's growth potential rather than causing outright failure in establishment like poor drainage can.