Mowing height affects turf by which statement?

• A. High turf creates deeper root growth, which allows grass to tolerate more drought and damage from root feeding insects. Mowing higher also tends to reduce the amount of weeds.
• B. High mowing reduces root depth.
• C. Mowing higher increases weed growth.
• D. Mowing height has no effect on drought tolerance.

Answer: (A)

Mowing height shapes how a turfgrass allocates energy between leaves and roots, which in turn affects drought tolerance, insect resilience, and weed pressure. When you cut the grass higher, the plant tends to invest more in root growth and overall vigor, leading to deeper, more extensive roots. Deeper roots improve water uptake and storage, helping the turf survive longer dry spells and recover after stress, including damage from root-feeding insects. A taller, fuller canopy also shade the soil more effectively, which suppresses many weed species by limiting light and creating a less inviting environment for weed germination and establishment.

So the statement that best reflects these effects is that higher mowing height promotes deeper root growth, increases drought tolerance and resilience to root pests, and, by maintaining a denser stand, tends to reduce weed pressure. Conversely, the idea that high mowing reduces root depth contradicts typical turf responses, and the notion that mowing higher increases weed growth clashes with the weed-suppressing effect of a healthier, denser turf. The claim that mowing height has no effect on drought tolerance is also incorrect, since drought tolerance is closely tied to root depth and overall turf vigor influenced by mowing height.