St. Augustine is the dominant grass in Georgetown’s established neighborhoods. Bermuda is common in new builds and full-sun yards. Zoysia is increasingly popular in higher-end HOA communities. If you are not sure which you have, the visual differences below sort it out quickly.
Why Williamson County soil matters
Georgetown sits on expansive clay and limestone substrate. Clay drains slowly and compacts, which limits how deeply grass roots can establish. That is why aeration matters more in Williamson County than in sandy-soil Texas markets. According to Williamson County AgriLife Extension guidance, Georgetown homeowners should plan for at least one annual aeration cycle, with fall being the preferred timing for St. Augustine.
St. Augustine vs. Bermuda vs. Zoysia
St. Augustine has wide, flat blades and tolerates partial shade, but it needs more water than Bermuda and is the most susceptible to chinch bugs. It should be mowed at 2 to 4 inches. Bermuda has fine, narrow blades, demands full sun, and is the more drought-tolerant choice for open Georgetown yards; mow it at 1 to 2 inches. Zoysia is medium-width and dense, mowed at 1 to 2.5 inches, and is the slow-growth pick favored in some HOA communities.
Never remove more than one-third of the grass canopy in a single mow. Cutting too short stresses roots — especially in Georgetown’s clay soil.
Chinch bugs: the most common St. Augustine problem
Chinch bugs are the most common St. Augustine pest in Williamson County. According to Williamson County AgriLife Extension, the primary check window is June 1 through June 15. Their damage looks nearly identical to drought stress, so yellowing despite adequate watering is the key signal. To confirm: remove both ends of a coffee can, press it two to three inches into the soil at the edge of a yellowing patch, and fill it with water. Chinch bugs float to the surface within a few minutes; a count of 25 or more per square foot crosses the treatment threshold.
When to call an operator
Yellowing patches in St. Augustine despite watering point to chinch bugs or fungal disease. Brown patches after heavy rain are usually fungal disease, common in clay after wet periods. Uneven growth in an established yard is typically resolved by core aeration. Thinning in shaded areas often means a grass-type mismatch — Bermuda in low sun. If your lawn has not greened up by late April, suspect pest or disease damage rather than normal dormancy.