Mowing Height and Frequency by Season

Protect turf crowns and suppress weeds using the one-third cutting rule and species-specific mowing heights for Kikuyu, LM Berea, Cynodon, and Buffalo grass.

1. The Situation

You are dealing with Scalped brown crowns after mowing or spongy thatch build-up between cuts. Across South African gardens, the most expensive mistake is buying random fertilisers, sprays, or replacement plants before confirming the physical root-zone cause. In this Lawn Order guide, we walk through the exact field observation needed to verify Removing more than one-third of the leaf blade in a single cut or setting the deck too low for the grass species and season. Look first at where the symptom starts—along hot concrete edges, in shaded south-facing corners, or across compacted traffic lines—and compare that spot with a healthy reference area nearby.

2. Root-Cause Diagnosis & Regional Context

Removing more than one-third of the leaf blade in a single cut or setting the deck too low for the grass species and season. Our corrective goal is: Set deck height to 30–45 mm for Kikuyu/Buffalo (20–30 mm for Cynodon), raise by one notch in shade or autumn, and mow often enough to remove only the top third. Before applying any product, check three variables: (1) root-zone moisture at 8–10 cm depth, (2) sunlight and airflow hours, and (3) mechanical stress from mowing or foot traffic. Regional context: All South African regions; adjust frequency from every 5–7 days in peak summer rain to every 14–21 days in cool months. Safety note: Disconnect spark plug or remove battery before measuring under the mower deck.

Long-Term Prevention

Turn this fix into a calm monthly habit. Record the date, the measurement you took, and the response after 7 days in your Lawn Order Garden Dashboard. By maintaining consistent mowing heights, 60 mm mulch layers in beds, and calibrated morning watering intervals, you prevent recurring stress cycles before they become visible emergencies.

Steps

  1. Measure your current grass height on a flat paving edge and set the mower deck to remove no more than 33% of leaf length.
  2. Keep Kikuyu at 30–40 mm in summer and raise to 45–50 mm going into autumn/winter to insulate stolons.
  3. Keep shade-tolerant LM Berea and Buffalo at 40–50 mm so broad leaves can capture filtered light.
  4. Alternate mowing direction (north-south then east-west) each week to prevent grain leaning and wheel rut compaction.