St. Augustine Grass Care: A Texas Homeowner’s Guide

St. Augustine grass covers more Texas lawns than any other turf variety — and for good reason. It’s heat-tolerant, grows dense enough to crowd out most weeds, and handles the humidity of Houston, San Antonio, and the Gulf Coast like a champ. But St. Augustine is also particular. Push it too hard or neglect the basics, and it can struggle fast. Lawn Tech has been caring for Texas lawns for years, and here’s what you need to know to keep your St. Augustine looking its best.

Mowing St. Augustine the Right Way

St. Augustine should be maintained at a height of 3.5 to 4 inches. This is taller than many homeowners expect, but that canopy height is what gives St. Augustine its natural weed-suppression ability and protects the root zone during Texas heat. Never remove more than one-third of the blade in a single mowing. Scalping — cutting too short — exposes stolons to sun damage and opens the turf to weed invasion.

One important exception: a deliberate spring scalp (cutting to 1–1.5 inches) in late February or early March can remove dead winter material and promote faster green-up. This is a Texas-specific practice and should only be done once per year, right before active growth resumes.

Watering Schedule for Texas Conditions

St. Augustine needs about 1 to 1.5 inches of water per week during the growing season. In Texas summers, that often means supplemental irrigation three to four times per week in extreme heat. Water deeply and in the early morning to minimize evaporation and reduce fungal disease pressure. Signs your St. Augustine is drought-stressed include a blue-gray tint to the blades and grass that doesn’t spring back when walked on.

Fertilizing St. Augustine in Texas

St. Augustine is a warm-season grass, so fertilization follows the active growing season — roughly April through September in most of Texas. A standard program includes:

• First application in mid-April once the lawn is fully green and actively growing
• Follow-up applications every 6–8 weeks through summer
• Final application no later than mid-September to avoid pushing tender growth before first frost

St. Augustine responds well to slow-release nitrogen. Iron supplements are also commonly needed in Texas alkaline soils to maintain the deep green color homeowners expect.

Common St. Augustine Problems in Texas

A few issues show up regularly in Texas St. Augustine lawns:

• Chinch bugs — the most damaging insect pest, causing irregular yellow patches in sunny areas during summer drought
• Take-all root rot — a fungal disease that causes yellowing and thinning, especially in spring and fall
• SAD virus (St. Augustine Decline) — a mosaic virus that creates yellow streaking on blades; no chemical treatment exists, so prevention through healthy turf management is key
• Grub damage — white grubs feeding on roots can cause spongy, lifting turf sections in fall

Shade Tolerance and Variety Selection

One of St. Augustine’s advantages is its ability to handle moderate shade — better than Bermuda or Zoysia. Palmetto and Seville varieties offer improved shade performance for Texas yards with significant tree cover. In deep shade, however, no grass thrives indefinitely; managing tree canopy and accepting ground cover alternatives in the deepest spots is a realistic long-term strategy.

Lawn Tech Knows Texas St. Augustine

Keeping St. Augustine healthy year-round requires attention to timing, soil conditions, and regional pest pressure. Lawn Tech’s Texas lawn care programs are built around the specific demands of St. Augustine turf — from spring fertilization to summer pest monitoring to fall prep. Contact Lawn Tech today to get your lawn on a program that works.